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
Modules linked in:
CPU: 0 PID: 8555 Comm: syz-executor574 Not tainted 4.14.238-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888094b7c1c0 task.stack: ffff8880948a0000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:sk_dst_get include/net/sock.h:1770 [inline]
RIP: 0010:pppol2tp_session_init+0x1ca/0x4d0 net/l2tp/l2tp_ppp.c:616
RSP: 0018:ffff8880948a7c50 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888095a34940 RCX: 1ffffffff11989ac
RDX: 0000000000000045 RSI: ffffffff87cced80 RDI: 0000000000000228
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020012
R10: ffff888094b7ca70 R11: ffff888094b7c1c0 R12: 000000000000216b
R13: 0000000000000002 R14: ffff888094978612 R15: ffff888094978630
FS:  0000000000f22300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 00000000a83e5000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pppol2tp_connect+0xd11/0x1370 net/l2tp/l2tp_ppp.c:790
 SYSC_connect net/socket.c:1655 [inline]
 SyS_connect+0x1f4/0x240 net/socket.c:1636
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x43fc19
RSP: 002b:00007ffc35fc1748 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 000000000000962e RCX: 000000000043fc19
RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc35fc18e8 R09: 00007ffc35fc18e8
R10: 00007ffc35fc18e8 R11: 0000000000000246 R12: 00007ffc35fc175c
R13: 431bde82d7b634db R14: 00000000004ad018 R15: 0000000000400488
Code: fa 80 3d fe f9 6d 03 00 0f 84 25 02 00 00 e8 2e 10 d0 fa 48 8d bd 28 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 db 02 00 00 48 8b ad 28 02 00 00 e8 90 f2 c0 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8880948a7c50
RIP: sk_dst_get include/net/sock.h:1770 [inline] RSP: ffff8880948a7c50
RIP: pppol2tp_session_init+0x1ca/0x4d0 net/l2tp/l2tp_ppp.c:616 RSP: ffff8880948a7c50
---[ end trace 8652af25bf10074f ]---