BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
PGD 800000014b365067 P4D 800000014b365067 PUD 146c5f067 PMD 0 
Oops: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 15845 Comm: syz-executor0 Not tainted 4.17.0-rc3+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:smc_getsockopt+0xc6/0x1a0 net/smc/af_smc.c:1298
RSP: 0018:ffff880182a5fd48 EFLAGS: 00010246
RAX: ffff880145f7d110 RBX: ffff880149132618 RCX: ffff880000000000
RDX: ffff880145f8d110 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000
RBP: ffff880182a5fdb8 R08: 00000000200002c0 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000028 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f24a555f700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 00000001a9fce000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __sys_getsockopt+0x49b/0x560 net/socket.c:1940
 __do_sys_getsockopt net/socket.c:1951 [inline]
 __se_sys_getsockopt net/socket.c:1948 [inline]
 __x64_sys_getsockopt+0x15d/0x1c0 net/socket.c:1948
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455979
RSP: 002b:00007f24a555ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f24a555f6d4 RCX: 0000000000455979
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 00000000200002c0 R09: 0000000000000000
R10: 0000000020000040 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000107 R14: 00000000006f5948 R15: 0000000000000000
Code: 0f 85 d0 00 00 00 4d 8b 37 4c 89 ff e8 54 bc 0f f8 4c 8b 38 44 8b 22 4c 89 75 b0 4d 8d 6e 28 4d 85 ff 0f 85 ba 00 00 00 45 89 e6 <4d> 8b 65 00 4c 89 ef e8 2e bc 0f f8 49 83 c4 70 48 83 38 00 0f 
RIP: smc_getsockopt+0xc6/0x1a0 net/smc/af_smc.c:1298 RSP: ffff880182a5fd48
CR2: 0000000000000028
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