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Fri, 30 Oct 2026 05:14:35 -0700 (PDT) Date: Fri, 30 Oct 2026 05:14:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae48a2b.6713f5d0.92cad.0001.GAE@google.com> Subject: [syzbot] [wpan?] general protection fault in ieee802154_llsec_dump_table (2) From: syzbot To: alex.aring@gmail.com, linux-kernel@vger.kernel.org, linux-wpan@vger.kernel.org, miquel.raynal@bootlin.com, netdev@vger.kernel.org, stefan@datenfreihafen.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c339f4010dea Merge tag 'platform-drivers-x86-v7.4-1' of gi.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=15a3dd95580000 kernel config: https://syzkaller.appspot.com/x/.config?x=119e5f4d0a8d39cf dashboard link: https://syzkaller.appspot.com/bug?extid=9ea34da5ca6100593c90 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151a448d580000 AI-generated root cause summary: In net/ieee802154/nl-mac.c, ieee802154_llsec_dump_table() iterates through all network devices in the namespace and assumes any device with dev->type == ARPHRD_IEEE802154 has a non-NULL ml_priv pointing to struct ieee802154_mlme_ops. However, devices such as TUN can have their link type changed to ARPHRD_IEEE802154 via the TUNSETLINK ioctl without initializing ml_priv (leaving it NULL). Consequently, ieee802154_llsec_dump_table() dereferences data.ops->llsec at offset 0x38 of a NULL pointer when dumping LLSEC tables, leading to a general protection fault / kernel crash (Denial of Service). full analysis: https://syzkaller.appspot.com/x/ai_root_cause?x=9ea34da5ca6100593c90 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9ea34da5ca6100593c90@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] CPU: 0 UID: 0 PID: 6025 Comm: syz-executor400 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 RIP: 0010:ieee802154_llsec_dump_table+0x204/0x5d0 net/ieee802154/nl-mac.c:778 Code: 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 d3 02 00 00 4d 8b be b8 07 00 00 49 8d 7f 38 4c 89 bc 24 98 00 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 a5 02 00 00 4d 8b 7f 38 4d 85 ff 0f 84 b2 01 00 RSP: 0018:ffffc900031ef4a0 EFLAGS: 00010202 RAX: 0000000000000007 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff8880314ccb00 RSI: ffffffff8b9ff162 RDI: 0000000000000038 RBP: 0000000000000026 R08: 0000000000000324 R09: 0000000000000324 R10: ffffc900031ef40f R11: ffffc900031ef520 R12: ffff888036830610 R13: 0000000000000000 R14: ffff88805d7a8000 R15: 0000000000000000 FS: 000055558d27f400(0000) GS:ffff88812248e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff8aa5bff8 CR3: 000000002ce9b000 CR4: 00000000003526f0 Call Trace: genl_dumpit+0x125/0x230 net/netlink/genetlink.c:1026 netlink_dump+0x53b/0xd00 net/netlink/af_netlink.c:2351 __netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2466 genl_family_rcv_msg_dumpit+0x1e2/0x2e0 net/netlink/genetlink.c:1075 genl_family_rcv_msg net/netlink/genetlink.c:1191 [inline] genl_rcv_msg+0x471/0x800 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2576 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x668/0x950 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x9ac/0x10c0 net/netlink/af_netlink.c:1920 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:818 [inline] __sys_sendto+0x492/0x4e0 net/socket.c:2283 __do_sys_sendto net/socket.c:2290 [inline] __se_sys_sendto net/socket.c:2286 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2286 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0fada8d8b7 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fff8aa5c1d0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000055558d27f400 RCX: 00007f0fada8d8b7 RDX: 0000000000000014 RSI: 00007fff8aa5c220 RDI: 0000000000000004 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007f0fadac9d23 R13: 00007fff8aa5c390 R14: 000000000000001d R15: 0000000000000002 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ieee802154_llsec_dump_table+0x204/0x5d0 net/ieee802154/nl-mac.c:778 Code: 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 d3 02 00 00 4d 8b be b8 07 00 00 49 8d 7f 38 4c 89 bc 24 98 00 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 a5 02 00 00 4d 8b 7f 38 4d 85 ff 0f 84 b2 01 00 RSP: 0018:ffffc900031ef4a0 EFLAGS: 00010202 RAX: 0000000000000007 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff8880314ccb00 RSI: ffffffff8b9ff162 RDI: 0000000000000038 RBP: 0000000000000026 R08: 0000000000000324 R09: 0000000000000324 R10: ffffc900031ef40f R11: ffffc900031ef520 R12: ffff888036830610 R13: 0000000000000000 R14: ffff88805d7a8000 R15: 0000000000000000 FS: 000055558d27f400(0000) GS:ffff88812258e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdac0fedc4 CR3: 000000002ce9b000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 89 f8 mov %edi,%eax 2: 48 c1 e8 03 shr $0x3,%rax 6: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) a: 0f 85 d3 02 00 00 jne 0x2e3 10: 4d 8b be b8 07 00 00 mov 0x7b8(%r14),%r15 17: 49 8d 7f 38 lea 0x38(%r15),%rdi 1b: 4c 89 bc 24 98 00 00 mov %r15,0x98(%rsp) 22: 00 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 0f 85 a5 02 00 00 jne 0x2d9 34: 4d 8b 7f 38 mov 0x38(%r15),%r15 38: 4d 85 ff test %r15,%r15 3b: 0f .byte 0xf 3c: 84 .byte 0x84 3d: b2 01 mov $0x1,%dl --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup