[moderation] [wireguard?] general protection fault in wg_packet_encrypt_worker

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d8ba32c5a460 Merge tag 'block-6.19-20251218' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=131e1392580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8bfa57a8c0ab3aa8
dashboard link: https://syzkaller.appspot.com/bug?extid=2ae5ebeb006e0ecd4d9e
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [Ja...@zx2c4.com andrew...@lunn.ch da...@davemloft.net edum...@google.com ku...@kernel.org linux-...@vger.kernel.org net...@vger.kernel.org pab...@redhat.com wire...@lists.zx2c4.com]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-d8ba32c5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6e33d94d5d54/vmlinux-d8ba32c5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6152cecdab14/bzImage-d8ba32c5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2ae5eb...@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc001fffffff: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x00000000fffffff8-0x00000000ffffffff]
CPU: 1 UID: 0 PID: 53 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: wg-crypt-wg2 wg_packet_encrypt_worker
RIP: 0010:wg_packet_encrypt_worker+0x242/0xbc0 drivers/net/wireguard/send.c:296
Code: 14 66 fb 39 dd 0f 8e 1c 07 00 00 e8 88 1a 66 fb 41 89 9f 80 00 00 00 48 8b 7c 24 40 e8 d7 07 20 05 48 8b 44 24 08 48 c1 e8 03 <42> 80 3c 30 00 0f 85 bb 08 00 00 48 8b 44 24 08 4c 89 7c 24 38 48
RSP: 0018:ffffc9000074fad8 EFLAGS: 00010207
RAX: 000000001fffffff RBX: 0000000000000003 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8daca488 RDI: ffffffff8bf2b500
RBP: 0000000000000400 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088e6d7 R11: ffff88801fd40b30 R12: ffff888024e8c000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88804b890dc0
FS: 0000000000000000(0000) GS:ffff8880977fc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca03689e9c CR3: 0000000070fc7000 CR4: 0000000000352ef0
Call Trace:
<TASK>
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:wg_packet_encrypt_worker+0x242/0xbc0 drivers/net/wireguard/send.c:296
Code: 14 66 fb 39 dd 0f 8e 1c 07 00 00 e8 88 1a 66 fb 41 89 9f 80 00 00 00 48 8b 7c 24 40 e8 d7 07 20 05 48 8b 44 24 08 48 c1 e8 03 <42> 80 3c 30 00 0f 85 bb 08 00 00 48 8b 44 24 08 4c 89 7c 24 38 48
RSP: 0018:ffffc9000074fad8 EFLAGS: 00010207
RAX: 000000001fffffff RBX: 0000000000000003 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8daca488 RDI: ffffffff8bf2b500
RBP: 0000000000000400 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088e6d7 R11: ffff88801fd40b30 R12: ffff888024e8c000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88804b890dc0
FS: 0000000000000000(0000) GS:ffff8880977fc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557a0bcf339e CR3: 0000000054085000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
0: 14 66 adc $0x66,%al
2: fb sti
3: 39 dd cmp %ebx,%ebp
5: 0f 8e 1c 07 00 00 jle 0x727
b: e8 88 1a 66 fb call 0xfb661a98
10: 41 89 9f 80 00 00 00 mov %ebx,0x80(%r15)
17: 48 8b 7c 24 40 mov 0x40(%rsp),%rdi
1c: e8 d7 07 20 05 call 0x52007f8
21: 48 8b 44 24 08 mov 0x8(%rsp),%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction
2f: 0f 85 bb 08 00 00 jne 0x8f0
35: 48 8b 44 24 08 mov 0x8(%rsp),%rax
3a: 4c 89 7c 24 38 mov %r15,0x38(%rsp)
3f: 48 rex.W


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