Message-ID: <6772c485.050a0220.2f3838.04c5.GAE@google.com>
Date: Mon, 30 Dec 2024 08:04:21 -0800
From: syzbot <syzbot+74f70bb1cb968bf09e4f@...kaller.appspotmail.com>
To: chengen.du@...onical.com, davem@...emloft.net, edumazet@...gle.com, 
	horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, 
	willemb@...gle.com, willemdebruijn.kernel@...il.com
Subject: [syzbot] [net?] kernel BUG in vlan_get_protocol_dgram

Hello,

syzbot found the following issue on:

HEAD commit:    d6ef8b40d075 Merge tag 'sound-6.13-rc5' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1707badf980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d269ef41b9262400
dashboard link: https://syzkaller.appspot.com/bug?extid=74f70bb1cb968bf09e4f
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d492c4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=170810b0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e695f9ff89ad/disk-d6ef8b40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/28ff2bace4a0/vmlinux-d6ef8b40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f25dce4c24ee/bzImage-d6ef8b40.xz

The issue was bisected to:

commit 79eecf631c14e7f4057186570ac20e2cfac3802e
Author: Chengen Du <chengen.du@...onical.com>
Date:   Sat Jul 13 11:47:35 2024 +0000

    af_packet: Handle outgoing VLAN packets without hardware offloading

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15ebd2f8580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17ebd2f8580000
console output: https://syzkaller.appspot.com/x/log.txt?x=13ebd2f8580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+74f70bb1cb968bf09e4f@...kaller.appspotmail.com
Fixes: 79eecf631c14 ("af_packet: Handle outgoing VLAN packets without hardware offloading")

skbuff: skb_under_panic: text:ffffffff8a8ccd05 len:29 put:14 head:ffff88807fc8e400 data:ffff88807fc8e3f4 tail:0x11 end:0x140 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:206!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 5892 Comm: syz-executor883 Not tainted 6.13.0-rc4-syzkaller-00054-gd6ef8b40d075 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:skb_panic net/core/skbuff.c:206 [inline]
RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:216
Code: 0b 8d 48 c7 c6 86 d5 25 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 5a 69 79 f7 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc900038d7638 EFLAGS: 00010282
RAX: 0000000000000087 RBX: dffffc0000000000 RCX: 609ffd18ea660600
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff88802483c8d0 R08: ffffffff817f0a8c R09: 1ffff9200071ae60
R10: dffffc0000000000 R11: fffff5200071ae61 R12: 0000000000000140
R13: ffff88807fc8e400 R14: ffff88807fc8e3f4 R15: 0000000000000011
FS:  00007fbac5e006c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbac5e00d58 CR3: 000000001238e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 skb_push+0xe5/0x100 net/core/skbuff.c:2636
 vlan_get_protocol_dgram+0x165/0x290 net/packet/af_packet.c:585
 packet_recvmsg+0x948/0x1ef0 net/packet/af_packet.c:3552
 sock_recvmsg_nosec net/socket.c:1033 [inline]
 sock_recvmsg+0x22f/0x280 net/socket.c:1055
 ____sys_recvmsg+0x1c6/0x480 net/socket.c:2803
 ___sys_recvmsg net/socket.c:2845 [inline]
 do_recvmmsg+0x426/0xab0 net/socket.c:2940
 __sys_recvmmsg net/socket.c:3014 [inline]
 __do_sys_recvmmsg net/socket.c:3037 [inline]
 __se_sys_recvmmsg net/socket.c:3030 [inline]
 __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3030
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbac5e66569
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbac5e00218 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fbac5ef0358 RCX: 00007fbac5e66569
RDX: 0000000000000001 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 00007fbac5ef0350 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010022 R11: 0000000000000246 R12: 00007fbac5ebd074
R13: 83a88896d4b9b107 R14: 07c6c9333d389ca9 R15: 0400000000000179
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic net/core/skbuff.c:206 [inline]
RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:216
Code: 0b 8d 48 c7 c6 86 d5 25 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 5a 69 79 f7 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc900038d7638 EFLAGS: 00010282
RAX: 0000000000000087 RBX: dffffc0000000000 RCX: 609ffd18ea660600
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff88802483c8d0 R08: ffffffff817f0a8c R09: 1ffff9200071ae60
R10: dffffc0000000000 R11: fffff5200071ae61 R12: 0000000000000140
R13: ffff88807fc8e400 R14: ffff88807fc8e3f4 R15: 0000000000000011
FS:  00007fbac5e006c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbac5e00d58 CR3: 000000001238e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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