netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 14202 Comm: syz-executor6 Not tainted 4.4.134-gcb3afe1 #51
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b0b4b000 task.stack: ffff8800b1270000
RIP: 0010:[<ffffffff835a4983>]  [<ffffffff835a4983>] __read_once_size include/linux/compiler.h:218 [inline]
RIP: 0010:[<ffffffff835a4983>]  [<ffffffff835a4983>] sk_dst_get include/net/sock.h:1740 [inline]
RIP: 0010:[<ffffffff835a4983>]  [<ffffffff835a4983>] pppol2tp_connect+0x873/0x1910 net/l2tp/l2tp_ppp.c:762
RSP: 0018:ffff8800b1277b50  EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8800a19e3300 RCX: ffffc900024c9000
RDX: 000000000000003b RSI: ffffffff835a496b RDI: 00000000000001d8
RBP: ffff8800b1277d00 R08: ffff8800b0b4b928 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8800b0b4b000 R12: ffff8800a1d3e000
R13: ffff8800a19e3330 R14: 0000000000000000 R15: ffff8801d80f2000
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f573bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000003372c000 CR3: 00000000b6fd0000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff835a490b 000000030000001d ffff8800b1277c58 ffff880000000004
 ffff8800a19e36d0 ffff8800a19e3312 1ffff1001624ef73 ffff8800a1d3e198
 ffff8801d80f2180 0000000041b58ab3 ffffffff8424b758 ffffffff835a4110
Call Trace:
 [<ffffffff82f1edf8>] SYSC_connect+0x1b8/0x300 net/socket.c:1557
 [<ffffffff82f21734>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c43ea>] sysenter_flags_fixed+0xd/0x17
Code: fd 80 3d 8b f1 45 01 00 0f 84 44 09 00 00 e8 45 cb da fd 49 8d be d8 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 60 0d 00 00 4d 8b be d8 01 00 00 e8 77 2a cd 
RIP  [<ffffffff835a4983>] __read_once_size include/linux/compiler.h:218 [inline]
RIP  [<ffffffff835a4983>] sk_dst_get include/net/sock.h:1740 [inline]
RIP  [<ffffffff835a4983>] pppol2tp_connect+0x873/0x1910 net/l2tp/l2tp_ppp.c:762
 RSP <ffff8800b1277b50>
---[ end trace 57a4ee080a323ad9 ]---