Use struct sctp_sack_info instead
unexpected usercopy without slab whitelist from SCTPv6 offset 1648 size 11
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10657 at mm/slab.c:4434 __check_heap_object+0xbc/0xd0 mm/slab.c:4433
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 10657 Comm: syz-executor0 Not tainted 4.14.0-rc7-next-20171103+ #38
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:906
RIP: 0010:__check_heap_object+0xbc/0xd0 mm/slab.c:4433
RSP: 0018:ffff8801d43070d8 EFLAGS: 00010282
RAX: 000000000000004a RBX: 0000000000000000 RCX: 0000000000000000
RDX: 000000000000004a RSI: ffffc9000178a000 RDI: ffffed003a860e0f
RBP: ffff8801d43070e0 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8801d3bbe040 R11: 0000000000000000 R12: ffffea0007215a80
R13: ffff8801c856bd70 R14: 000000000000000b R15: ffffea0007215a80
 check_heap_object mm/usercopy.c:222 [inline]
 __check_object_size+0x22c/0x4f0 mm/usercopy.c:248
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:143 [inline]
 copy_to_user include/linux/uaccess.h:154 [inline]
 sctp_getsockopt_events net/sctp/socket.c:4972 [inline]
 sctp_getsockopt+0x2b90/0x70b0 net/sctp/socket.c:7012
 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2924
 SYSC_getsockopt net/socket.c:1882 [inline]
 SyS_getsockopt+0x178/0x340 net/socket.c:1864
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007f2790b97be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 000000000000000b RSI: 0000000000000084 RDI: 0000000000000013
RBP: 0000000000000086 R08: 0000000020306000 R09: 0000000000000000
R10: 0000000020fd2ff5 R11: 0000000000000212 R12: 00000000006ef690
R13: 00000000ffffffff R14: 00007f2790b986d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..