Use struct sctp_sack_info instead
BUG: unable to handle kernel paging request at 00000000cfb7f581
IP: __get_user_4+0x1e/0x30 arch/x86/lib/getuser.S:72
PGD 5e28067 P4D 5e28067 PUD 5e2a067 PMD 0 
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
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Modules linked in:
CPU: 1 PID: 10440 Comm: syz-executor2 Not tainted 4.15.0-rc1-mm1+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 000000002c82458a task.stack: 000000005c75d8b4
RIP: 0010:__get_user_4+0x1e/0x30 arch/x86/lib/getuser.S:72
RSP: 0018:ffff8801ca6df840 EFLAGS: 00010287
RAX: 0000000020000003 RBX: 0000000000000003 RCX: ffffffff8199eeb8
RDX: 0000000000000001 RSI: ffffc900029b2000 RDI: 0000000000000282
RBP: ffff8801ca6dfd18 R08: ffff8801db51f740 R09: 1ffff100394dbedd
R10: ffff8801d96de080 R11: 0000000000000000 R12: 1ffff100394dbf0e
R13: 0000000020000000 R14: ffff8801d42d03c0 R15: 0000000000000000
FS:  00007f17a7a11700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 00000001c2198000 CR4: 00000000001426e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff3 DR7: 0000000000bb060a
Call Trace:
 ip_getsockopt+0x90/0x220 net/ipv4/ip_sockglue.c:1562
 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3325
 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2927
 SYSC_getsockopt net/socket.c:1882 [inline]
 SyS_getsockopt+0x178/0x340 net/socket.c:1864
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007f17a7a10c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 000000000000001f
RBP: 00000000000003e0 R08: 0000000020000000 R09: 0000000000000000
R10: 0000000020c9e000 R11: 0000000000000212 R12: 00000000006f2da0
R13: 00000000ffffffff R14: 00007f17a7a116d4 R15: 0000000000000000
Code: 00 c3 90 66 2e 0f 1f 84 00 00 00 00 00 48 83 c0 03 72 4f 65 48 8b 14 25 40 65 01 00 48 3b 82 a0 15 00 00 73 3d 0f 1f 00 8b 50 fd <31> c0 0f 1f 00 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 83 c0 
RIP: __get_user_4+0x1e/0x30 arch/x86/lib/getuser.S:72 RSP: ffff8801ca6df840
CR2: fffffffffffffff8
---[ end trace 9492edfa00524379 ]---
Kernel panic - not syncing: Fatal exception
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Kernel Offset: disabled
Rebooting in 86400 seconds..