* [syzbot ci] Re: bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap [not found] <20260206055113.63476-1-yangfeng59949@163.com> @ 2026-02-06 11:02 ` syzbot ci 0 siblings, 0 replies; 3+ messages in thread From: syzbot ci @ 2026-02-06 11:02 UTC (permalink / raw) To: bpf, davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni, yangfeng59949 Cc: syzbot, syzkaller-bugs syzbot ci has tested the following series [v3] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap https://lore.kernel.org/all/20260206055113.63476-1-yangfeng59949@163.com * [PATCH v3] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap and found the following issue: WARNING in skb_dst_set_noref Full report is available here: https://ci.syzbot.org/series/ebdff606-6251-4db9-ab50-448f5433094a *** WARNING in skb_dst_set_noref tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 1ace9bac1ad2bc6a0a70baaa16d22b7e783e88c5 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/673700c1-fa90-4aa2-8342-e6b397961829/config C repro: https://ci.syzbot.org/findings/ad5a5f81-3d84-45ac-90ec-9a169eb16405/c_repro syz repro: https://ci.syzbot.org/findings/ad5a5f81-3d84-45ac-90ec-9a169eb16405/syz_repro ------------[ cut here ]------------ !rcu_read_lock_held() && !rcu_read_lock_bh_held() WARNING: ./include/linux/skbuff.h:1235 at skb_dst_set_noref+0x14a/0x1a0 include/linux/skbuff.h:1235, CPU#1: syz.0.17/5979 Modules linked in: CPU: 1 UID: 0 PID: 5979 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:skb_dst_set_noref+0x14a/0x1a0 include/linux/skbuff.h:1235 Code: 5d 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 9b 80 e9 01 cc e8 95 58 30 f8 90 0f 0b 90 e9 2f ff ff ff e8 87 58 30 f8 90 <0f> 0b 90 e9 5d ff ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 76 ff ff ff RSP: 0018:ffffc90004487a20 EFLAGS: 00010293 RAX: ffffffff89923f99 RBX: ffffc90004487ba0 RCX: ffff888103713a80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffc90004487be3 R09: 1ffff92000890f7c R10: dffffc0000000000 R11: fffff52000890f7d R12: 0000000000000000 R13: ffff88817331d858 R14: 1ffff1102e663b0b R15: ffff88817331d800 FS: 0000555590ae6500(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb63fff CR3: 00000001139cc000 CR4: 00000000000006f0 Call Trace: <TASK> bpf_prog_test_run_skb+0xed8/0x1eb0 net/bpf/test_run.c:1164 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f21c579acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff4c8461d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f21c5a15fa0 RCX: 00007f21c579acb9 RDX: 0000000000000050 RSI: 0000200000000780 RDI: 000000000000000a RBP: 00007f21c5808bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f21c5a15fac R14: 00007f21c5a15fa0 R15: 00007f21c5a15fa0 </TASK> *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <20260209015111.28144-1-yangfeng59949@163.com>]
* [syzbot ci] Re: bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap [not found] <20260209015111.28144-1-yangfeng59949@163.com> @ 2026-02-09 7:30 ` syzbot ci 0 siblings, 0 replies; 3+ messages in thread From: syzbot ci @ 2026-02-09 7:30 UTC (permalink / raw) To: andrii, ast, bpf, daniel, davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni, yangfeng59949 Cc: syzbot, syzkaller-bugs syzbot ci has tested the following series [v4] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap https://lore.kernel.org/all/20260209015111.28144-1-yangfeng59949@163.com * [PATCH v4] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap and found the following issues: * general protection fault in ip6_tnl_xmit * general protection fault in tnl_update_pmtu * general protection fault in wg_xmit * general protection fault in xfrm_lookup_with_ifid Full report is available here: https://ci.syzbot.org/series/af38a4c5-943d-44d2-91e6-299e4e0a94db *** general protection fault in ip6_tnl_xmit tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: db975debcb8c4cd367a78811bc1ba84c83f854bd arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/c4ef1868-7d17-40c4-b5a7-b2d7bec3a6fe/config C repro: https://ci.syzbot.org/findings/311bc7a0-3bf0-490c-b561-a21f38f4d8e9/c_repro syz repro: https://ci.syzbot.org/findings/311bc7a0-3bf0-490c-b561-a21f38f4d8e9/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 1 UID: 0 PID: 5991 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:dst_neigh_lookup include/net/dst.h:404 [inline] RIP: 0010:ip6_tnl_xmit+0x14a1/0x2af0 net/ipv6/ip6_tunnel.c:1123 Code: 74 12 4c 89 ef e8 af d8 ea f7 48 ba 00 00 00 00 00 fc ff df 4d 01 f4 49 83 c4 18 4d 8b 6d 00 49 83 c5 68 4c 89 e8 48 c1 e8 03 <80> 3c 10 00 74 08 4c 89 ef e8 81 d8 ea f7 4d 8b 5d 00 4c 89 ff 31 RSP: 0018:ffffc90003976e60 EFLAGS: 00010202 RAX: 000000000000000d RBX: 1ffff1102e6c7d07 RCX: ffff88810b2c57c0 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003977028 R08: ffff88810b2c57c0 R09: 0000000000000002 R10: 000000000000dd86 R11: 0000000000000000 R12: ffff88816a0ce066 R13: 0000000000000068 R14: ffff88816a0ce000 R15: ffffc90003977ba0 FS: 000055555f394500(0000) GS:ffff8882a9927000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30263fff CR3: 000000010d832000 CR4: 00000000000006f0 Call Trace: <TASK> ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1400 [inline] ip6_tnl_start_xmit+0xc79/0x11d0 net/ipv6/ip6_tunnel.c:1448 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869 __dev_queue_xmit+0x14dd/0x32a0 net/core/dev.c:4819 dev_queue_xmit include/linux/netdevice.h:3381 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153 ____bpf_clone_redirect net/core/filter.c:2487 [inline] bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2450 bpf_prog_2f59963de350c2d2+0x5e/0x67 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x354/0x830 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x13b4/0x1e00 net/bpf/test_run.c:1168 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff39439acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc03f9fef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ff394615fa0 RCX: 00007ff39439acb9 RDX: 0000000000000028 RSI: 00002000000000c0 RDI: 000000000000000a RBP: 00007ff394408bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff394615fac R14: 00007ff394615fa0 R15: 00007ff394615fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dst_neigh_lookup include/net/dst.h:404 [inline] RIP: 0010:ip6_tnl_xmit+0x14a1/0x2af0 net/ipv6/ip6_tunnel.c:1123 Code: 74 12 4c 89 ef e8 af d8 ea f7 48 ba 00 00 00 00 00 fc ff df 4d 01 f4 49 83 c4 18 4d 8b 6d 00 49 83 c5 68 4c 89 e8 48 c1 e8 03 <80> 3c 10 00 74 08 4c 89 ef e8 81 d8 ea f7 4d 8b 5d 00 4c 89 ff 31 RSP: 0018:ffffc90003976e60 EFLAGS: 00010202 RAX: 000000000000000d RBX: 1ffff1102e6c7d07 RCX: ffff88810b2c57c0 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003977028 R08: ffff88810b2c57c0 R09: 0000000000000002 R10: 000000000000dd86 R11: 0000000000000000 R12: ffff88816a0ce066 R13: 0000000000000068 R14: ffff88816a0ce000 R15: ffffc90003977ba0 FS: 000055555f394500(0000) GS:ffff8882a9927000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30263fff CR3: 000000010d832000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 74 12 je 0x14 2: 4c 89 ef mov %r13,%rdi 5: e8 af d8 ea f7 call 0xf7ead8b9 a: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 11: fc ff df 14: 4d 01 f4 add %r14,%r12 17: 49 83 c4 18 add $0x18,%r12 1b: 4d 8b 6d 00 mov 0x0(%r13),%r13 1f: 49 83 c5 68 add $0x68,%r13 23: 4c 89 e8 mov %r13,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ef mov %r13,%rdi 33: e8 81 d8 ea f7 call 0xf7ead8b9 38: 4d 8b 5d 00 mov 0x0(%r13),%r11 3c: 4c 89 ff mov %r15,%rdi 3f: 31 .byte 0x31 *** general protection fault in tnl_update_pmtu tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: db975debcb8c4cd367a78811bc1ba84c83f854bd arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/c4ef1868-7d17-40c4-b5a7-b2d7bec3a6fe/config C repro: https://ci.syzbot.org/findings/78a52206-e4f0-4a95-a881-32bbaab25810/c_repro syz repro: https://ci.syzbot.org/findings/78a52206-e4f0-4a95-a881-32bbaab25810/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057] CPU: 0 UID: 0 PID: 5980 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:skb_dst_update_pmtu_no_confirm include/net/dst.h:565 [inline] RIP: 0010:tnl_update_pmtu+0x52b/0x1190 net/ipv4/ip_tunnel.c:533 Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 ad 38 2a f8 4c 8b 3b 49 83 c7 50 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 87 38 2a f8 4d 8b 3f 4d 85 ff 8b 5c RSP: 0018:ffffc90003d56e28 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffffc90003d57ba8 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffc90003d57ba0 RDI: 0000000000000000 RBP: ffffc90003d57ba0 R08: ffffffff89db4393 R09: ffffffff8e35a3a0 R10: ffffc90003d56de0 R11: fffff520007aadbe R12: ffff88816a305380 R13: ffff88816a3053d8 R14: 1ffff1102d460a7b R15: 0000000000000050 FS: 000055559418b500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30863fff CR3: 00000001bea06000 CR4: 00000000000006f0 Call Trace: <TASK> ip_tunnel_xmit+0xd36/0x2430 net/ipv4/ip_tunnel.c:805 __gre_xmit net/ipv4/ip_gre.c:490 [inline] ipgre_xmit+0x8e6/0xc60 net/ipv4/ip_gre.c:694 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869 __dev_queue_xmit+0x14dd/0x32a0 net/core/dev.c:4819 dev_queue_xmit include/linux/netdevice.h:3381 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153 ____bpf_clone_redirect net/core/filter.c:2487 [inline] bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2450 bpf_prog_7c64685fc60f7d44+0x5f/0x68 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x354/0x830 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x13b4/0x1e00 net/bpf/test_run.c:1168 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6668d9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcdef544a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6669015fa0 RCX: 00007f6668d9acb9 RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007f6668e08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6669015fac R14: 00007f6669015fa0 R15: 00007f6669015fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_dst_update_pmtu_no_confirm include/net/dst.h:565 [inline] RIP: 0010:tnl_update_pmtu+0x52b/0x1190 net/ipv4/ip_tunnel.c:533 Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 ad 38 2a f8 4c 8b 3b 49 83 c7 50 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 87 38 2a f8 4d 8b 3f 4d 85 ff 8b 5c RSP: 0018:ffffc90003d56e28 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffffc90003d57ba8 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffc90003d57ba0 RDI: 0000000000000000 RBP: ffffc90003d57ba0 R08: ffffffff89db4393 R09: ffffffff8e35a3a0 R10: ffffc90003d56de0 R11: fffff520007aadbe R12: ffff88816a305380 R13: ffff88816a3053d8 R14: 1ffff1102d460a7b R15: 0000000000000050 FS: 000055559418b500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30863fff CR3: 00000001bea06000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 8: 74 08 je 0x12 a: 48 89 df mov %rbx,%rdi d: e8 ad 38 2a f8 call 0xf82a38bf 12: 4c 8b 3b mov (%rbx),%r15 15: 49 83 c7 50 add $0x50,%r15 19: 4c 89 f8 mov %r15,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 87 38 2a f8 call 0xf82a38bf 38: 4d 8b 3f mov (%r15),%r15 3b: 4d 85 ff test %r15,%r15 3e: 8b .byte 0x8b 3f: 5c pop %rsp *** general protection fault in wg_xmit tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: db975debcb8c4cd367a78811bc1ba84c83f854bd arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/c4ef1868-7d17-40c4-b5a7-b2d7bec3a6fe/config C repro: https://ci.syzbot.org/findings/9650e699-cf43-4d3b-841d-ae1a23f976f0/c_repro syz repro: https://ci.syzbot.org/findings/9650e699-cf43-4d3b-841d-ae1a23f976f0/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 UID: 0 PID: 5985 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:dst_mtu include/net/dst.h:219 [inline] RIP: 0010:wg_xmit+0x355/0xf70 drivers/net/wireguard/device.c:173 Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 83 84 d9 fb 4d 8b 3f 49 83 c7 20 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 5d 84 d9 fb 4d 8b 3f 49 81 ff e0 38 RSP: 0018:ffffc90003cc7060 EFLAGS: 00010202 RAX: 0000000000000004 RBX: ffffc90003cc7ba0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003cc7190 R08: ffffffff8fced577 R09: 1ffffffff1f9daae R10: dffffc0000000000 R11: fffffbfff1f9daaf R12: ffffc90003cc70c0 R13: 1ffff1102ebe283b R14: ffff888175f14180 R15: 0000000000000020 FS: 00005555734f8500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30663fff CR3: 00000001704ae000 CR4: 00000000000006f0 Call Trace: <TASK> __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869 __dev_queue_xmit+0x14dd/0x32a0 net/core/dev.c:4819 dev_queue_xmit include/linux/netdevice.h:3381 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153 ____bpf_clone_redirect net/core/filter.c:2487 [inline] bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2450 bpf_prog_bd919e7baf24f63c+0x5f/0x68 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x354/0x830 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x13b4/0x1e00 net/bpf/test_run.c:1168 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc57899acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd806bfbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc578c15fa0 RCX: 00007fc57899acb9 RDX: 0000000000000050 RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007fc578a08bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc578c15fac R14: 00007fc578c15fa0 R15: 00007fc578c15fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dst_mtu include/net/dst.h:219 [inline] RIP: 0010:wg_xmit+0x355/0xf70 drivers/net/wireguard/device.c:173 Code: 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 83 84 d9 fb 4d 8b 3f 49 83 c7 20 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 5d 84 d9 fb 4d 8b 3f 49 81 ff e0 38 RSP: 0018:ffffc90003cc7060 EFLAGS: 00010202 RAX: 0000000000000004 RBX: ffffc90003cc7ba0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003cc7190 R08: ffffffff8fced577 R09: 1ffffffff1f9daae R10: dffffc0000000000 R11: fffffbfff1f9daaf R12: ffffc90003cc70c0 R13: 1ffff1102ebe283b R14: ffff888175f14180 R15: 0000000000000020 FS: 00005555734f8500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30663fff CR3: 00000001704ae000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 80 3c 08 00 74 filds 0x7400083c(%rax) 6: 08 4c 89 ff or %cl,-0x1(%rcx,%rcx,4) a: e8 83 84 d9 fb call 0xfbd98492 f: 4d 8b 3f mov (%r15),%r15 12: 49 83 c7 20 add $0x20,%r15 16: 4c 89 f8 mov %r15,%rax 19: 48 c1 e8 03 shr $0x3,%rax 1d: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 24: fc ff df * 27: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2b: 74 08 je 0x35 2d: 4c 89 ff mov %r15,%rdi 30: e8 5d 84 d9 fb call 0xfbd98492 35: 4d 8b 3f mov (%r15),%r15 38: 49 rex.WB 39: 81 .byte 0x81 3a: ff e0 jmp *%rax 3c: 38 .byte 0x38 *** general protection fault in xfrm_lookup_with_ifid tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: db975debcb8c4cd367a78811bc1ba84c83f854bd arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/c4ef1868-7d17-40c4-b5a7-b2d7bec3a6fe/config C repro: https://ci.syzbot.org/findings/2ae3c5a4-d593-4385-8e69-f77a40c2382d/c_repro syz repro: https://ci.syzbot.org/findings/2ae3c5a4-d593-4385-8e69-f77a40c2382d/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5978 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:xfrm_lookup_with_ifid+0xe1/0x1af0 net/xfrm/xfrm_policy.c:3181 Code: 24 20 4d 8d 66 08 4c 89 e0 48 c1 e8 03 4d 89 ee 42 80 3c 28 00 74 08 4c 89 e7 e8 5a 1f 17 f8 4d 8b 24 24 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 94 17 00 00 41 0f b7 04 24 89 44 24 28 RSP: 0018:ffffc900045f6ea0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc900045f6f40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc900045f6f50 RBP: ffffc900045f6fb8 R08: ffffc900045f6f4f R09: 0000000000000000 R10: ffffc900045f6f40 R11: fffff520008bedea R12: 0000000000000000 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00005555873db500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fa63fff CR3: 000000016e128000 CR4: 00000000000006f0 Call Trace: <TASK> xfrm_lookup net/xfrm/xfrm_policy.c:3336 [inline] xfrm_lookup_route+0x3c/0x1c0 net/xfrm/xfrm_policy.c:3347 vti_xmit net/ipv4/ip_vti.c:217 [inline] vti_tunnel_xmit+0x48e/0x18f0 net/ipv4/ip_vti.c:307 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869 __dev_queue_xmit+0x14dd/0x32a0 net/core/dev.c:4819 dev_queue_xmit include/linux/netdevice.h:3381 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153 ____bpf_clone_redirect net/core/filter.c:2487 [inline] bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2450 bpf_prog_e16758452f539c38+0x5f/0x68 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x354/0x830 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0x13b4/0x1e00 net/bpf/test_run.c:1168 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f722f59acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2a77bfd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f722f815fa0 RCX: 00007f722f59acb9 RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007f722f608bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f722f815fac R14: 00007f722f815fa0 R15: 00007f722f815fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:xfrm_lookup_with_ifid+0xe1/0x1af0 net/xfrm/xfrm_policy.c:3181 Code: 24 20 4d 8d 66 08 4c 89 e0 48 c1 e8 03 4d 89 ee 42 80 3c 28 00 74 08 4c 89 e7 e8 5a 1f 17 f8 4d 8b 24 24 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 94 17 00 00 41 0f b7 04 24 89 44 24 28 RSP: 0018:ffffc900045f6ea0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc900045f6f40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc900045f6f50 RBP: ffffc900045f6fb8 R08: ffffc900045f6f4f R09: 0000000000000000 R10: ffffc900045f6f40 R11: fffff520008bedea R12: 0000000000000000 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00005555873db500(0000) GS:ffff88818e327000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fa63fff CR3: 000000016e128000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 24 20 and $0x20,%al 2: 4d 8d 66 08 lea 0x8(%r14),%r12 6: 4c 89 e0 mov %r12,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 4d 89 ee mov %r13,%r14 10: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 15: 74 08 je 0x1f 17: 4c 89 e7 mov %r12,%rdi 1a: e8 5a 1f 17 f8 call 0xf8171f79 1f: 4d 8b 24 24 mov (%r12),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 94 17 00 00 jne 0x17cb 37: 41 0f b7 04 24 movzwl (%r12),%eax 3c: 89 44 24 28 mov %eax,0x28(%rsp) *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <20260205092227.126665-1-yangfeng59949@163.com>]
* [syzbot ci] Re: bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap [not found] <20260205092227.126665-1-yangfeng59949@163.com> @ 2026-02-05 15:44 ` syzbot ci 0 siblings, 0 replies; 3+ messages in thread From: syzbot ci @ 2026-02-05 15:44 UTC (permalink / raw) To: bpf, davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni, yangfeng59949 Cc: syzbot, syzkaller-bugs syzbot ci has tested the following series [v2] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap https://lore.kernel.org/all/20260205092227.126665-1-yangfeng59949@163.com * [PATCH v2] bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap and found the following issues: * WARNING in skb_dst_set * general protection fault in percpu_counter_add_batch * general protection fault in tnl_update_pmtu * general protection fault in xfrm_lookup_with_ifid Full report is available here: https://ci.syzbot.org/series/c278e614-0520-4be1-8e1b-b6ed06beb3cd *** WARNING in skb_dst_set tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 75cd3beb64d0977009e3d1a2d0c03715d3e5e156 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/8d5f34b6-d9df-4c4a-9d51-7f4f910f379a/config C repro: https://ci.syzbot.org/findings/9f4f73a7-44d6-4d8b-8fed-818bb8ca054d/c_repro syz repro: https://ci.syzbot.org/findings/9f4f73a7-44d6-4d8b-8fed-818bb8ca054d/syz_repro ------------[ cut here ]------------ (skb->_skb_refdst & ~(1UL)) && !(skb->_skb_refdst & 1UL) WARNING: ./include/linux/skbuff.h:1171 at skb_dst_check_unset include/linux/skbuff.h:1170 [inline], CPU#1: syz.0.17/5978 WARNING: ./include/linux/skbuff.h:1171 at skb_dst_set+0xfd/0x140 include/linux/skbuff.h:1217, CPU#1: syz.0.17/5978 Modules linked in: CPU: 1 UID: 0 PID: 5978 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:skb_dst_check_unset include/linux/skbuff.h:1170 [inline] RIP: 0010:skb_dst_set+0xfd/0x140 include/linux/skbuff.h:1217 Code: 2d 00 00 74 08 4c 89 f7 e8 80 13 98 f8 49 89 1e 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 64 5c 30 f8 90 <0f> 0b 90 e9 6d ff ff ff 44 89 e1 80 e1 07 38 c1 7c 8f be 04 00 00 RSP: 0018:ffffc90005367b58 EFLAGS: 00010293 RAX: ffffffff89923bbc RBX: dffffc0000000001 RCX: ffff8881037d8000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff1102edaad5b R08: ffffffff8fced777 R09: 1ffffffff1f9daee R10: dffffc0000000000 R11: ffffffff817422b0 R12: 0000000000000000 R13: ffff888176d56b01 R14: ffff888176d56ad8 R15: ffff888176d56a80 FS: 0000555564e8a500(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fe63fff CR3: 000000016852c000 CR4: 00000000000006f0 Call Trace: <TASK> bpf_prog_test_run_skb+0xe46/0x1ea0 net/bpf/test_run.c:1166 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4714 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6236 __do_sys_bpf kernel/bpf/syscall.c:6331 [inline] __se_sys_bpf kernel/bpf/syscall.c:6329 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6329 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f51a119acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff3a40e428 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f51a1415fa0 RCX: 00007f51a119acb9 RDX: 0000000000000050 RSI: 00002000000003c0 RDI: 000000000000000a RBP: 00007f51a1208bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51a1415fac R14: 00007f51a1415fa0 R15: 00007f51a1415fa0 </TASK> *** general protection fault in percpu_counter_add_batch tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 75cd3beb64d0977009e3d1a2d0c03715d3e5e156 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/8d5f34b6-d9df-4c4a-9d51-7f4f910f379a/config C repro: https://ci.syzbot.org/findings/f58ed194-db04-464a-95de-a6d6cc45527a/c_repro syz repro: https://ci.syzbot.org/findings/f58ed194-db04-464a-95de-a6d6cc45527a/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df] CPU: 1 UID: 0 PID: 5976 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:percpu_counter_add_batch+0x3e/0x1d0 lib/percpu_counter.c:98 Code: d4 49 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 e6 76 f2 fc 48 89 5c 24 10 4c 8d 73 58 4c 89 f0 48 c1 e8 03 48 89 04 24 <42> 80 3c 38 00 74 08 4c 89 f7 e8 d3 2c 5a fd 49 8b 06 65 8b 28 41 RSP: 0018:ffffc90003b37778 EFLAGS: 00010206 RAX: 000000000000001b RBX: 0000000000000080 RCX: ffff888115b8ba80 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000080 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000766ee4 R12: 0000000000000020 R13: ffffffffffffffff R14: 00000000000000d8 R15: dffffc0000000000 FS: 000055555baf2500(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc74af2e38 CR3: 0000000115cec000 CR4: 00000000000006f0 Call Trace: <TASK> dst_entries_add include/net/dst_ops.h:59 [inline] dst_count_dec net/core/dst.c:162 [inline] dst_release+0x126/0x1b0 net/core/dst.c:176 refdst_drop include/net/dst.h:266 [inline] skb_dst_drop include/net/dst.h:278 [inline] ____bpf_skb_set_tunnel_key net/core/filter.c:4867 [inline] bpf_skb_set_tunnel_key+0x239/0xa30 net/core/filter.c:4835 bpf_prog_adb554717e5d6596+0x4f/0x5c bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x354/0x830 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0xe02/0x1ea0 net/bpf/test_run.c:1164 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4714 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6236 __do_sys_bpf kernel/bpf/syscall.c:6331 [inline] __se_sys_bpf kernel/bpf/syscall.c:6329 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6329 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fca1679acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdef1739c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fca16a15fa0 RCX: 00007fca1679acb9 RDX: 0000000000000050 RSI: 0000200000000d80 RDI: 000000000000000a RBP: 00007fca16808bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fca16a15fac R14: 00007fca16a15fa0 R15: 00007fca16a15fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:percpu_counter_add_batch+0x3e/0x1d0 lib/percpu_counter.c:98 Code: d4 49 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 e6 76 f2 fc 48 89 5c 24 10 4c 8d 73 58 4c 89 f0 48 c1 e8 03 48 89 04 24 <42> 80 3c 38 00 74 08 4c 89 f7 e8 d3 2c 5a fd 49 8b 06 65 8b 28 41 RSP: 0018:ffffc90003b37778 EFLAGS: 00010206 RAX: 000000000000001b RBX: 0000000000000080 RCX: ffff888115b8ba80 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000080 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000766ee4 R12: 0000000000000020 R13: ffffffffffffffff R14: 00000000000000d8 R15: dffffc0000000000 FS: 000055555baf2500(0000) GS:ffff8882a9928000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc74af2e38 CR3: 0000000115cec000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 49 89 f5 mov %rsi,%r13 3: 48 89 fb mov %rdi,%rbx 6: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 d: fc ff df 10: e8 e6 76 f2 fc call 0xfcf276fb 15: 48 89 5c 24 10 mov %rbx,0x10(%rsp) 1a: 4c 8d 73 58 lea 0x58(%rbx),%r14 1e: 4c 89 f0 mov %r14,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 48 89 04 24 mov %rax,(%rsp) * 29: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 d3 2c 5a fd call 0xfd5a2d0b 38: 49 8b 06 mov (%r14),%rax 3b: 65 8b 28 mov %gs:(%rax),%ebp 3e: 41 rex.B *** general protection fault in tnl_update_pmtu tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 75cd3beb64d0977009e3d1a2d0c03715d3e5e156 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/8d5f34b6-d9df-4c4a-9d51-7f4f910f379a/config C repro: https://ci.syzbot.org/findings/2b87e46f-6cd5-4189-a1f4-896ea63e96a0/c_repro syz repro: https://ci.syzbot.org/findings/2b87e46f-6cd5-4189-a1f4-896ea63e96a0/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057] CPU: 0 UID: 0 PID: 5994 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:skb_dst_update_pmtu_no_confirm include/net/dst.h:565 [inline] RIP: 0010:tnl_update_pmtu+0x52b/0x1190 net/ipv4/ip_tunnel.c:533 Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 0d 3a 2a f8 4c 8b 3b 49 83 c7 50 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 e7 39 2a f8 4d 8b 3f 4d 85 ff 8b 5c RSP: 0018:ffffc90004ef6f68 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffffffff9a2dcec8 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff9a2dcec0 RDI: 0000000000000000 RBP: ffffffff9a2dcec0 R08: ffffffff89db11f3 R09: ffffffff8e35a3a0 R10: ffffc90004ef6f20 R11: fffff520009dede6 R12: ffff888112583800 R13: ffff888112583858 R14: 1ffff110224b070b R15: 0000000000000050 FS: 000055557643a500(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30363fff CR3: 00000001744e0000 CR4: 00000000000006f0 Call Trace: <TASK> ip_tunnel_xmit+0xd36/0x2430 net/ipv4/ip_tunnel.c:805 __gre_xmit net/ipv4/ip_gre.c:490 [inline] ipgre_xmit+0x8e6/0xc60 net/ipv4/ip_gre.c:694 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869 __dev_queue_xmit+0x14dd/0x32a0 net/core/dev.c:4819 dev_queue_xmit include/linux/netdevice.h:3381 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153 ____bpf_clone_redirect net/core/filter.c:2487 [inline] bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2450 bpf_prog_885767c90d177146+0x62/0x6b bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x354/0x830 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0xe02/0x1ea0 net/bpf/test_run.c:1164 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4714 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6236 __do_sys_bpf kernel/bpf/syscall.c:6331 [inline] __se_sys_bpf kernel/bpf/syscall.c:6329 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6329 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fad0c59acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe97cab158 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fad0c815fa0 RCX: 00007fad0c59acb9 RDX: 0000000000000028 RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007fad0c608bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fad0c815fac R14: 00007fad0c815fa0 R15: 00007fad0c815fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_dst_update_pmtu_no_confirm include/net/dst.h:565 [inline] RIP: 0010:tnl_update_pmtu+0x52b/0x1190 net/ipv4/ip_tunnel.c:533 Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 0d 3a 2a f8 4c 8b 3b 49 83 c7 50 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 e7 39 2a f8 4d 8b 3f 4d 85 ff 8b 5c RSP: 0018:ffffc90004ef6f68 EFLAGS: 00010206 RAX: 000000000000000a RBX: ffffffff9a2dcec8 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff9a2dcec0 RDI: 0000000000000000 RBP: ffffffff9a2dcec0 R08: ffffffff89db11f3 R09: ffffffff8e35a3a0 R10: ffffc90004ef6f20 R11: fffff520009dede6 R12: ffff888112583800 R13: ffff888112583858 R14: 1ffff110224b070b R15: 0000000000000050 FS: 000055557643a500(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30363fff CR3: 00000001744e0000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 8: 74 08 je 0x12 a: 48 89 df mov %rbx,%rdi d: e8 0d 3a 2a f8 call 0xf82a3a1f 12: 4c 8b 3b mov (%rbx),%r15 15: 49 83 c7 50 add $0x50,%r15 19: 4c 89 f8 mov %r15,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 e7 39 2a f8 call 0xf82a3a1f 38: 4d 8b 3f mov (%r15),%r15 3b: 4d 85 ff test %r15,%r15 3e: 8b .byte 0x8b 3f: 5c pop %rsp *** general protection fault in xfrm_lookup_with_ifid tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 75cd3beb64d0977009e3d1a2d0c03715d3e5e156 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/8d5f34b6-d9df-4c4a-9d51-7f4f910f379a/config C repro: https://ci.syzbot.org/findings/5c4a2d70-b003-439e-8039-496b9009f1e9/c_repro syz repro: https://ci.syzbot.org/findings/5c4a2d70-b003-439e-8039-496b9009f1e9/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5985 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:xfrm_lookup_with_ifid+0xe1/0x1af0 net/xfrm/xfrm_policy.c:3181 Code: 24 20 4d 8d 66 08 4c 89 e0 48 c1 e8 03 4d 89 ee 42 80 3c 28 00 74 08 4c 89 e7 e8 ba 20 17 f8 4d 8b 24 24 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 94 17 00 00 41 0f b7 04 24 89 44 24 28 RSP: 0018:ffffc90003e96fe0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc90003e97080 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90003e97090 RBP: ffffc90003e970f8 R08: ffffc90003e9708f R09: 0000000000000000 R10: ffffc90003e97080 R11: fffff520007d2e12 R12: 0000000000000000 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 000055558c0ab500(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30363fff CR3: 00000001b9fc8000 CR4: 00000000000006f0 Call Trace: <TASK> xfrm_lookup net/xfrm/xfrm_policy.c:3336 [inline] xfrm_lookup_route+0x3c/0x1c0 net/xfrm/xfrm_policy.c:3347 vti_xmit net/ipv4/ip_vti.c:217 [inline] vti_tunnel_xmit+0x48e/0x18f0 net/ipv4/ip_vti.c:307 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3869 __dev_queue_xmit+0x14dd/0x32a0 net/core/dev.c:4819 dev_queue_xmit include/linux/netdevice.h:3381 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153 ____bpf_clone_redirect net/core/filter.c:2487 [inline] bpf_clone_redirect+0x313/0x4b0 net/core/filter.c:2450 bpf_prog_e16758452f539c38+0x5f/0x68 bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_test_run+0x354/0x830 net/bpf/test_run.c:423 bpf_prog_test_run_skb+0xe02/0x1ea0 net/bpf/test_run.c:1164 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4714 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6236 __do_sys_bpf kernel/bpf/syscall.c:6331 [inline] __se_sys_bpf kernel/bpf/syscall.c:6329 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6329 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe30af9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffa3d1a918 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fe30b215fa0 RCX: 00007fe30af9acb9 RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007fe30b008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe30b215fac R14: 00007fe30b215fa0 R15: 00007fe30b215fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:xfrm_lookup_with_ifid+0xe1/0x1af0 net/xfrm/xfrm_policy.c:3181 Code: 24 20 4d 8d 66 08 4c 89 e0 48 c1 e8 03 4d 89 ee 42 80 3c 28 00 74 08 4c 89 e7 e8 ba 20 17 f8 4d 8b 24 24 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 94 17 00 00 41 0f b7 04 24 89 44 24 28 RSP: 0018:ffffc90003e96fe0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc90003e97080 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90003e97090 RBP: ffffc90003e970f8 R08: ffffc90003e9708f R09: 0000000000000000 R10: ffffc90003e97080 R11: fffff520007d2e12 R12: 0000000000000000 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 000055558c0ab500(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30363fff CR3: 00000001b9fc8000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 24 20 and $0x20,%al 2: 4d 8d 66 08 lea 0x8(%r14),%r12 6: 4c 89 e0 mov %r12,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 4d 89 ee mov %r13,%r14 10: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 15: 74 08 je 0x1f 17: 4c 89 e7 mov %r12,%rdi 1a: e8 ba 20 17 f8 call 0xf81720d9 1f: 4d 8b 24 24 mov (%r12),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 94 17 00 00 jne 0x17cb 37: 41 0f b7 04 24 movzwl (%r12),%eax 3c: 89 44 24 28 mov %eax,0x28(%rsp) *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. ^ permalink raw reply [flat|nested] 3+ messages in thread
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2026-02-06 11:02 ` [syzbot ci] Re: bpf: test_run: Fix the null pointer dereference issue in bpf_lwt_xmit_push_encap syzbot ci
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2026-02-09 7:30 ` syzbot ci
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2026-02-05 15:44 ` syzbot ci
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