BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
PGD 80000001ac862067 P4D 80000001ac862067 PUD 1a51fa067 PMD 0 
Oops: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 12941 Comm: syz-executor0 Not tainted 4.17.0-rc3+ #92
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:ffff8801acc7fd60 EFLAGS: 00010246
RAX: ffff8801a45e4790 RBX: ffff8801ad98c358 RCX: ffff880000000000
RDX: ffff8801a8424790 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801acc7fdc8 R08: 0000000000000002 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f98df31d700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 00000001a4806000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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: 0033:0x4559d9
RSP: 002b:00007f98df31cc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f98df31d6d4 RCX: 00000000004559d9
RDX: 0000000000000001 RSI: 0000000000000100 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000020000040 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000068e R14: 00000000006fddf0 R15: 0000000000000000
Code: 0f 85 ce 00 00 00 4d 8b 37 4c 89 ff e8 a6 bb 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 80 bb 0f f8 49 83 c4 68 48 83 38 00 0f 
RIP: smc_setsockopt+0xc4/0x1a0 net/smc/af_smc.c:1287 RSP: ffff8801acc7fd60
CR2: 0000000000000028
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