[syzbot] [virt?] [net?] general protection fault in vsock_connectible_has_data

[syzbot <syzbot+3affdbfc986ecd9200fd@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    8ce4f287524c net: libwx: fix firmware mailbox abnormal ret..
git tree:       net
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13f06edf980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1c541fa8af5c9cc7
dashboard link: https://syzkaller.appspot.com/bug?extid=3affdbfc986ecd9200fd
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=15695418580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=124c56f8580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e09bf4b8939b/disk-8ce4f287.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f7f7846f83db/vmlinux-8ce4f287.xz
kernel image: https://storage.googleapis.com/syzbot-assets/44540dea47ac/bzImage-8ce4f287.xz

The issue was bisected to:

commit 69139d2919dd4aa9a553c8245e7c63e82613e3fc
Author: Cong Wang <cong.wang@bytedance.com>
Date:   Mon Aug 12 02:21:53 2024 +0000

    vsock: fix recursive ->recvmsg calls

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=116bc4b0580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=136bc4b0580000
console output: https://syzkaller.appspot.com/x/log.txt?x=156bc4b0580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3affdbfc986ecd9200fd@syzkaller.appspotmail.com
Fixes: 69139d2919dd ("vsock: fix recursive ->recvmsg calls")

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000014: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000a0-0x00000000000000a7]
CPU: 1 UID: 0 PID: 5828 Comm: syz-executor976 Not tainted 6.13.0-rc5-syzkaller-00142-g8ce4f287524c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:vsock_connectible_has_data+0x85/0x100 net/vmw_vsock/af_vsock.c:882
Code: 80 3c 38 00 74 08 48 89 df e8 e7 e0 5f f6 48 8b 1b 66 83 fd 05 75 3a e8 d9 78 f9 f5 48 81 c3 a0 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 bc e0 5f f6 4c 8b 1b 4c 89 f7 41
RSP: 0018:ffffc900015976f8 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: ffff888033e09e00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: 0000000000000005 R08: ffffffff8ba5fadc R09: 1ffffffff285492b
R10: dffffc0000000000 R11: fffffbfff285492c R12: 0000000000002000
R13: dffffc0000000000 R14: ffff888033e18000 R15: dffffc0000000000
FS:  00005555565ca380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200061c8 CR3: 0000000074f74000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vsock_has_data net/vmw_vsock/vsock_bpf.c:30 [inline]
 vsock_bpf_recvmsg+0x4b5/0x10a0 net/vmw_vsock/vsock_bpf.c:87
 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: 0033:0x7fb38b2465e9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd43f6938 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fffd43f6b08 RCX: 00007fb38b2465e9
RDX: 0000000000000001 RSI: 00000000200061c0 RDI: 0000000000000003
RBP: 00007fb38b2b9610 R08: 0000000000000000 R09: 00007fffd43f6b08
R10: 0000000000002000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffd43f6af8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsock_connectible_has_data+0x85/0x100 net/vmw_vsock/af_vsock.c:882
Code: 80 3c 38 00 74 08 48 89 df e8 e7 e0 5f f6 48 8b 1b 66 83 fd 05 75 3a e8 d9 78 f9 f5 48 81 c3 a0 00 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 bc e0 5f f6 4c 8b 1b 4c 89 f7 41
RSP: 0018:ffffc900015976f8 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: ffff888033e09e00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: 0000000000000005 R08: ffffffff8ba5fadc R09: 1ffffffff285492b
R10: dffffc0000000000 R11: fffffbfff285492c R12: 0000000000002000
R13: dffffc0000000000 R14: ffff888033e18000 R15: dffffc0000000000
FS:  00005555565ca380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000066c7e0 CR3: 0000000074f74000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	80 3c 38 00          	cmpb   $0x0,(%rax,%rdi,1)
   4:	74 08                	je     0xe
   6:	48 89 df             	mov    %rbx,%rdi
   9:	e8 e7 e0 5f f6       	call   0xf65fe0f5
   e:	48 8b 1b             	mov    (%rbx),%rbx
  11:	66 83 fd 05          	cmp    $0x5,%bp
  15:	75 3a                	jne    0x51
  17:	e8 d9 78 f9 f5       	call   0xf5f978f5
  1c:	48 81 c3 a0 00 00 00 	add    $0xa0,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 bc e0 5f f6       	call   0xf65fe0f5
  39:	4c 8b 1b             	mov    (%rbx),%r11
  3c:	4c 89 f7             	mov    %r14,%rdi
  3f:	41                   	rex.B


---
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