binder: 16764:16780 transaction failed 29189/-22, size 24-8 line 3014
binder: undelivered TRANSACTION_ERROR: 29189
binder: 16764:16777 ioctl c0306201 20000440 returned -22
binder: undelivered TRANSACTION_ERROR: 29189
BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
IP: [<ffffffff835a67f8>] sock_hold include/net/sock.h:589 [inline]
IP: [<ffffffff835a67f8>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
PGD 1d364a067 PUD 1d2d3a067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 16786 Comm: syz-executor6 Not tainted 4.4.145-g2241aa9 #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b7354800 task.stack: ffff88009ed30000
RIP: 0010:[<ffffffff835a67f8>]  [<ffffffff835a67f8>] sock_hold include/net/sock.h:589 [inline]
RIP: 0010:[<ffffffff835a67f8>]  [<ffffffff835a67f8>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
RSP: 0018:ffff88009ed37b48  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801d494ef00 RCX: ffffc9000a6c1000
RDX: 1ffff1003a929e10 RSI: ffffffff835a08d3 RDI: ffff8801d494f080
RBP: ffff88009ed37bb8 R08: ffff8800b7355100 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8463a1e0 R12: ffff8801d494f228
R13: ffff88009ed37cd0 R14: ffff8801d494f180 R15: ffffffff835a03b0
FS:  00007fa7023a5700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000001cdd63000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8113fc2a ffff8801d494ef20 ffff8801d494f2d8 ffff8801d494f190
 ffffffff838c7e40 ffff8801d494f230 ffff8801d494f2d0 ffff8801d494efe0
 ff92229300000000 ffff8801d6c30000 0000000000000000 ffff8801d6c30030
Call Trace:
 [<ffffffff835aabf0>] pppol2tp_connect+0x10f0/0x1910 net/l2tp/l2tp_ppp.c:725
 [<ffffffff82f23798>] SYSC_connect+0x1b8/0x300 net/socket.c:1557
 [<ffffffff82f260d4>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff838c84e5>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 00 00 48 8d bb 80 01 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 36 06 00 00 48 8b 83 80 01 00 00 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 e1 13 
RIP  [<ffffffff835a67f8>] sock_hold include/net/sock.h:589 [inline]
RIP  [<ffffffff835a67f8>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
 RSP <ffff88009ed37b48>
CR2: 0000000000000080
---[ end trace c043a930bd5150c1 ]---