syzbot

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1098 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:j1939_sk_send_loop net/can/j1939/socket.c:988 [inline]
RIP: 0010:j1939_sk_sendmsg+0x6d6/0x1450 net/can/j1939/socket.c:1105
Code: e8 bf f3 f3 fa 48 8b 8d 50 ff ff ff b8 f9 06 00 00 48 81 f9 f9 06 00 00 48 0f 46 c1 48 89 85 60 ff ff ff 48 8b 85 20 ff ff ff <80> 38 00 0f 85 fa 0a 00 00 48 8b 85 40 ff ff ff 48 8b 58 48 48 8b
RSP: 0018:ffff888092307a28 EFLAGS: 00010297
RAX: dffffc0000000009 RBX: 00000000000001f3 RCX: 00000000000001f3
RDX: 0000000000000000 RSI: ffffffff867f3121 RDI: 0000000000000007
RBP: ffff888092307b40 R08: ffff88809d3560c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a53bc510 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f3aa7aa8700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2855f64000 CR3: 00000000a9a2f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:657
 ___sys_sendmsg+0x803/0x920 net/socket.c:2311
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2356
 __do_sys_sendmsg net/socket.c:2365 [inline]
 __se_sys_sendmsg net/socket.c:2363 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2363
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3aa7aa7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3aa7aa86d4
R13: 00000000004c804e R14: 00000000004de4d0 R15: 00000000ffffffff
Modules linked in:
---[ end trace b9d9b67571908ef8 ]---
RIP: 0010:j1939_sk_send_loop net/can/j1939/socket.c:988 [inline]
RIP: 0010:j1939_sk_sendmsg+0x6d6/0x1450 net/can/j1939/socket.c:1105
Code: e8 bf f3 f3 fa 48 8b 8d 50 ff ff ff b8 f9 06 00 00 48 81 f9 f9 06 00 00 48 0f 46 c1 48 89 85 60 ff ff ff 48 8b 85 20 ff ff ff <80> 38 00 0f 85 fa 0a 00 00 48 8b 85 40 ff ff ff 48 8b 58 48 48 8b
RSP: 0018:ffff888092307a28 EFLAGS: 00010297
RAX: dffffc0000000009 RBX: 00000000000001f3 RCX: 00000000000001f3
RDX: 0000000000000000 RSI: ffffffff867f3121 RDI: 0000000000000007
RBP: ffff888092307b40 R08: ffff88809d3560c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a53bc510 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f3aa7aa8700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2855f64000 CR3: 00000000a9a2f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400