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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:3d1:b0:875:d675:55f2 with SMTP id ca18e2360f4ac-879c28caec0mr13346039f.7.1752615996309; Tue, 15 Jul 2025 14:46:36 -0700 (PDT) Date: Tue, 15 Jul 2025 14:46:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6876cc3c.a00a0220.3af5df.000a.GAE@google.com> Subject: [syzbot] [net?] KASAN: slab-use-after-free Read in tcp_prune_ofo_queue From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, kuniyu@google.com, linux-kernel@vger.kernel.org, ncardwell@google.com, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 55e8757c6962 Merge branch 'net-mctp-improved-bind-handling' git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=15834382580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f8235fb7e74dd7f6 dashboard link: https://syzkaller.appspot.com/bug?extid=9d2a6ef56c3805144bf0 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1445058c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=148e098c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6c4b54c5d7b6/disk-55e8757c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3885c5b76f45/vmlinux-55e8757c.xz kernel image: https://storage.googleapis.com/syzbot-assets/f16a3c7b11be/bzImage-55e8757c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9d2a6ef56c3805144bf0@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in tcp_can_ingest net/ipv4/tcp_input.c:4896 [inline] BUG: KASAN: slab-use-after-free in tcp_prune_ofo_queue+0x37e/0x6e0 net/ipv4/tcp_input.c:5520 Read of size 4 at addr ffff88802779f350 by task syz.2.45/6135 CPU: 1 UID: 0 PID: 6135 Comm: syz.2.45 Not tainted 6.16.0-rc5-syzkaller-01444-g55e8757c6962 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 tcp_can_ingest net/ipv4/tcp_input.c:4896 [inline] tcp_prune_ofo_queue+0x37e/0x6e0 net/ipv4/tcp_input.c:5520 tcp_prune_queue net/ipv4/tcp_input.c:5575 [inline] tcp_try_rmem_schedule+0xb6b/0x1830 net/ipv4/tcp_input.c:4907 tcp_data_queue+0x4e3/0x6380 net/ipv4/tcp_input.c:5192 tcp_rcv_established+0xf9e/0x1eb0 net/ipv4/tcp_input.c:6208 tcp_v4_do_rcv+0xa23/0xce0 net/ipv4/tcp_ipv4.c:1925 sk_backlog_rcv include/net/sock.h:1148 [inline] __release_sock+0x21c/0x350 net/core/sock.c:3188 release_sock+0x5f/0x1f0 net/core/sock.c:3742 tcp_sendmsg+0x39/0x50 net/ipv4/tcp.c:1394 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa36638e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdf475f108 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fa3665b5fa0 RCX: 00007fa36638e929 RDX: 000000000000059a RSI: 0000200000000580 RDI: 0000000000000003 RBP: 00007fa366410b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000010008095 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa3665b5fa0 R14: 00007fa3665b5fa0 R15: 0000000000000006 Allocated by task 6135: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:659 alloc_skb_fclone include/linux/skbuff.h:1386 [inline] tcp_stream_alloc_skb+0x3d/0x340 net/ipv4/tcp.c:892 tso_fragment net/ipv4/tcp_output.c:2174 [inline] tcp_write_xmit+0xeec/0x67f0 net/ipv4/tcp_output.c:2819 __tcp_push_pending_frames+0x97/0x360 net/ipv4/tcp_output.c:3016 tcp_sendmsg_locked+0x483c/0x56d0 net/ipv4/tcp.c:1356 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1393 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6135: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kmem_cache_free+0x18f/0x400 mm/slub.c:4745 tcp_prune_ofo_queue+0x198/0x6e0 net/ipv4/tcp_input.c:5517 tcp_prune_queue net/ipv4/tcp_input.c:5575 [inline] tcp_try_rmem_schedule+0xb6b/0x1830 net/ipv4/tcp_input.c:4907 tcp_data_queue+0x4e3/0x6380 net/ipv4/tcp_input.c:5192 tcp_rcv_established+0xf9e/0x1eb0 net/ipv4/tcp_input.c:6208 tcp_v4_do_rcv+0xa23/0xce0 net/ipv4/tcp_ipv4.c:1925 sk_backlog_rcv include/net/sock.h:1148 [inline] __release_sock+0x21c/0x350 net/core/sock.c:3188 release_sock+0x5f/0x1f0 net/core/sock.c:3742 tcp_sendmsg+0x39/0x50 net/ipv4/tcp.c:1394 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802779f180 which belongs to the cache skbuff_fclone_cache of size 488 The buggy address is located 464 bytes inside of freed 488-byte region [ffff88802779f180, ffff88802779f368) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2779e head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff8881416b9a00 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff8881416b9a00 dead000000000122 0000000000000000 head: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffea00009de781 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6135, tgid 6135 (syz.2.45), ts 109281901479, free_ts 109187086002 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] kmem_cache_alloc_node_noprof+0x280/0x3c0 mm/slub.c:4249 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:659 alloc_skb_fclone include/linux/skbuff.h:1386 [inline] tcp_stream_alloc_skb+0x3d/0x340 net/ipv4/tcp.c:892 tcp_sendmsg_locked+0xefc/0x56d0 net/ipv4/tcp.c:1198 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1393 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5216 tgid 5216 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 __slab_free+0x326/0x400 mm/slub.c:4554 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204 getname_flags+0xb8/0x540 fs/namei.c:146 do_readlinkat+0xbc/0x500 fs/stat.c:575 __do_sys_readlink fs/stat.c:613 [inline] __se_sys_readlink fs/stat.c:610 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:610 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802779f200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802779f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802779f300: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ^ ffff88802779f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802779f400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- 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