binder: 7064:7070 ioctl c0306201 20007000 returned -14 loop1: p1 p2 p3 p4 BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 IP: [] sock_hold include/net/sock.h:584 [inline] IP: [] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911 PGD 1d77a3067 PUD 1b846d067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 7071 Comm: syz-executor2 Not tainted 4.9.124-g09eb2ba #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d51a0000 task.stack: ffff8801d51d0000 RIP: 0010:[] [] sock_hold include/net/sock.h:584 [inline] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911 RSP: 0018:ffff8801d51d7ac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8801b7d4c780 RCX: 1ffff1003aa3411d RDX: 1ffff10038728120 RSI: ffff8801d51a08c8 RDI: ffff8801c3940900 RBP: ffff8801d51d7b60 R08: ffff8801d51a08e8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c39407d8 R13: 0000000000000000 R14: ffff8801c3940780 R15: ffff8801d51d7c78 FS: 00007f12d66b2700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000080 CR3: 00000001cbac4000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000000 0000000000000004 ffff8801cd6f9100 ffff8801d51d7d20 ffff8801c3940780 ffff8801b7d4c8d8 ffff8801c39407d8 ffff8801b7d4c8d0 ffff8801b7d4c830 ffff8801c39407a0 0000000000000000 0000000000000000 Call Trace: [] pppol2tp_connect+0x10d7/0x18f0 net/l2tp/l2tp_ppp.c:718 [] SYSC_connect+0x1b8/0x300 net/socket.c:1575 [] SyS_connect+0x24/0x30 net/socket.c:1556 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 RIP [] sock_hold include/net/sock.h:584 [inline] RIP [] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911 RSP CR2: 0000000000000080 ---[ end trace cdfa24c2415fc993 ]---