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Message-ID: <000000000000a33d5b05e551bc31@google.com>
Date: Wed, 03 Aug 2022 01:08:23 -0700
From: syzbot <syzbot+dc42341ea62e8eb6c1f7@...kaller.appspotmail.com>
To: bridge@...ts.linux-foundation.org, coreteam@...filter.org,
davem@...emloft.net, edumazet@...gle.com, fw@...len.de,
kadlec@...filter.org, kuba@...nel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
netfilter-devel@...r.kernel.org, pabeni@...hat.com,
pablo@...filter.org, razor@...ckwall.org, roopa@...dia.com,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in br_nf_pre_routing_finish (2)
Hello,
syzbot found the following issue on:
HEAD commit: d7c4c9e075f8 ax25: fix incorrect dev_tracker usage
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=123a0cde080000
kernel config: https://syzkaller.appspot.com/x/.config?x=26034e6fe0075dad
dashboard link: https://syzkaller.appspot.com/bug?extid=dc42341ea62e8eb6c1f7
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dc42341ea62e8eb6c1f7@...kaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 32332 Comm: kworker/0:4 Not tainted 5.19.0-rc8-syzkaller-00103-gd7c4c9e075f8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_power_efficient neigh_managed_work
RIP: 0010:br_nf_pre_routing_finish+0x200/0x1ad0 net/bridge/br_netfilter_hooks.c:360
Code: 83 c0 01 38 d0 7c 08 84 d2 0f 85 e3 12 00 00 48 8d 7b 02 45 0f b7 74 24 3e 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b9
RSP: 0018:ffffc90000007868 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 0000000000000000 RSI: ffffffff883fc456 RDI: 0000000000000002
RBP: ffff88801d0ee000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807e999000
R13: 0000000000000010 R14: 00000000000005dc R15: ffff888074392800
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde65908d64 CR3: 000000004d41b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
NF_HOOK include/linux/netfilter.h:307 [inline]
NF_HOOK include/linux/netfilter.h:301 [inline]
br_nf_pre_routing+0xae3/0x1f00 net/bridge/br_netfilter_hooks.c:531
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:255 [inline]
br_handle_frame+0x8df/0x1280 net/bridge/br_input.c:399
__netif_receive_skb_core+0xa13/0x3920 net/core/dev.c:5378
__netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5482
__netif_receive_skb+0x24/0x1b0 net/core/dev.c:5598
process_backlog+0x3a0/0x7c0 net/core/dev.c:5926
__napi_poll+0xb3/0x6e0 net/core/dev.c:6492
napi_poll net/core/dev.c:6559 [inline]
net_rx_action+0x9c1/0xd90 net/core/dev.c:6670
__do_softirq+0x29b/0x9c2 kernel/softirq.c:571
do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
</IRQ>
<TASK>
do_softirq kernel/softirq.c:464 [inline]
__local_bh_enable_ip+0x102/0x120 kernel/softirq.c:396
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:br_nf_pre_routing_finish+0x200/0x1ad0 net/bridge/br_netfilter_hooks.c:360
Code: 83 c0 01 38 d0 7c 08 84 d2 0f 85 e3 12 00 00 48 8d 7b 02 45 0f b7 74 24 3e 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b9
RSP: 0018:ffffc90000007868 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100
RDX: 0000000000000000 RSI: ffffffff883fc456 RDI: 0000000000000002
RBP: ffff88801d0ee000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807e999000
R13: 0000000000000010 R14: 00000000000005dc R15: ffff888074392800
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde65908d64 CR3: 000000004d41b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 83 c0 01 add $0x1,%eax
3: 38 d0 cmp %dl,%al
5: 7c 08 jl 0xf
7: 84 d2 test %dl,%dl
9: 0f 85 e3 12 00 00 jne 0x12f2
f: 48 8d 7b 02 lea 0x2(%rbx),%rdi
13: 45 0f b7 74 24 3e movzwl 0x3e(%r12),%r14d
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 01 add $0x1,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 .byte 0x85
3f: b9 .byte 0xb9
---
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@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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