BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
PGD 80000001b2e18067 P4D 80000001b2e18067 PUD 1b3e4f067 PMD 0 
Oops: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 15693 Comm: syz-executor3 Not tainted 4.17.0-rc3+ #94
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:smc_setsockopt+0xc4/0x1a0 net/smc/af_smc.c:1287
RSP: 0018:ffff88015130fd60 EFLAGS: 00010246
RAX: ffff8801a9b542d0 RBX: ffff8801a492e098 RCX: ffff880000000000
RDX: ffff88019cd642d0 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff88015130fdc8 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f9ce4f65700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 000000019c4ea000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __sys_setsockopt+0x4af/0x560 net/socket.c:1903
 __do_sys_setsockopt net/socket.c:1914 [inline]
 __se_sys_setsockopt net/socket.c:1911 [inline]
 __x64_sys_setsockopt+0x15c/0x1c0 net/socket.c:1911
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a09
RSP: 002b:00007f9ce4f64c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f9ce4f656d4 RCX: 0000000000455a09
RDX: 000000000000000c RSI: 0000000000000000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000624 R14: 00000000006fd400 R15: 0000000000000000
Code: 0f 85 ce 00 00 00 4d 8b 37 4c 89 ff e8 b6 a8 0f f8 4c 8b 38 44 8b 22 4c 89 75 a8 4d 8d 6e 28 4d 85 ff 0f 85 b8 00 00 00 45 89 e6 <4d> 8b 65 00 4c 89 ef e8 90 a8 0f f8 49 83 c4 68 48 83 38 00 0f 
RIP: smc_setsockopt+0xc4/0x1a0 net/smc/af_smc.c:1287 RSP: ffff88015130fd60
CR2: 0000000000000028
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