general protection fault in tcp_sendmsg_locked

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: f02af7b0 Merge 4.14.143 into android-4.14
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=17de42a5600000
kernel config: https://syzkaller.appspot.com/x/.config?x=4d9cf2fd50fd7015
dashboard link: https://syzkaller.appspot.com/bug?extid=5c1207be8cae83ffc24c
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+5c1207...@syzkaller.appspotmail.com

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 NOPTI
Modules linked in:
CPU: 0 PID: 3996 Comm: syz-executor.3 Not tainted 4.14.143+ #0
task: 00000000847253df task.stack: 000000009b796db7
RIP: 0010:tcp_sendmsg_locked+0x509/0x2f50 net/ipv4/tcp.c:1281
RSP: 0018:ffff88819e0d7ae8 EFLAGS: 00010206
RAX: 0000000000000011 RBX: ffff8881c6ba6780 RCX: 00000000000000b6
RDX: ffffffff8252e3a0 RSI: ffffc9000213f000 RDI: 0000000000000088
RBP: ffff8881d3499512 R08: 0000000000000001 R09: ffffed103a6932e8
R10: ffffed103a6932e7 R11: 0000000000000000 R12: ffff88819e0d7d90
R13: 0000000000000000 R14: ffff8881d3499500 R15: dffffc0000000000
FS: 00007f76f1fd3700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc2240ad98 CR3: 00000001c7544005 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457
inet_sendmsg+0x15b/0x520 net/ipv4/af_inet.c:760
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xb7/0x100 net/socket.c:656
SYSC_sendto net/socket.c:1763 [inline]
SyS_sendto+0x1de/0x2f0 net/socket.c:1731
do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4598e9
RSP: 002b:00007f76f1fd2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004598e9
RDX: fffffffffffffccf RSI: 0000000020000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: ffffffffffffff37
R10: 0000000000000240 R11: 0000000000000246 R12: 00007f76f1fd36d4
R13: 00000000004c7874 R14: 00000000004dd170 R15: 00000000ffffffff
Code: 4e 32 de fe 48 85 db 0f 84 12 08 00 00 e8 40 32 de fe 8b 84 24 08 01
00 00 49 8d bd 88 00 00 00 89 44 24 08 48 89 f8 48 c1 e8 03 <42> 0f b6 04
38 84 c0 74 06 0f 8e 07 24 00 00 41 f6 85 88 00 00
RIP: tcp_sendmsg_locked+0x509/0x2f50 net/ipv4/tcp.c:1281 RSP:
ffff88819e0d7ae8
---[ end trace 553b9e4a7ce81ed0 ]---


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.