BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
PGD 80000001498d4067 P4D 80000001498d4067 PUD 147388067 PMD 0 
Oops: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 7383 Comm: syz-executor6 Not tainted 4.17.0-rc3+ #88
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:ffff8801499ffd60 EFLAGS: 00010246
RAX: ffff8801456102d0 RBX: ffff88014a936098 RCX: ffff880000000000
RDX: ffff8801456142d0 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff8801499ffdc8 R08: 0000000000000008 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f2e4c307700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 00000001498c6000 CR4: 00000000001406f0
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: 0033:0x455979
RSP: 002b:00007f2e4c306c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f2e4c3076d4 RCX: 0000000000455979
RDX: 0000000000000075 RSI: 0000000000000084 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000008 R09: 0000000000000000
R10: 00000000200012c0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000610 R14: 00000000006fd220 R15: 0000000000000000
Code: 0f 85 ce 00 00 00 4d 8b 37 4c 89 ff e8 f6 bd 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 d0 bd 0f f8 49 83 c4 68 48 83 38 00 0f 
RIP: smc_setsockopt+0xc4/0x1a0 net/smc/af_smc.c:1287 RSP: ffff8801499ffd60
CR2: 0000000000000028
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