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kernel BUG at mm/usercopy.c:84!
invalid opcode: 0000 [#1] SMP KASAN
netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'.
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 13774 Comm: syz-executor5 Not tainted 4.15.0-rc4-next-20171221+ #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:report_usercopy mm/usercopy.c:76 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:276
RSP: 0018:ffff8801d875f5b0 EFLAGS: 00010282
RAX: 0000000000000061 RBX: ffffffff859297a0 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90003f2f000 RDI: ffffed003b0ebeaa
RBP: ffff8801d875f6a0 R08: 1ffff1003b0ebe38 R09: 0000000000000000
R10: 0000000093c0b1cf R11: 0000000000000000 R12: ffffffff85929760
R13: ffff8801d4eac4d0 R14: 00000000000003c6 R15: ffffea000753ab00
FS:  00007f3f89947700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000028c6cd8 CR3: 00000001bdba5002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:143 [inline]
 copy_from_user include/linux/uaccess.h:146 [inline]
 memdup_user+0x46/0x90 mm/util.c:168
 sctp_setsockopt_reset_streams net/sctp/socket.c:3930 [inline]
 sctp_setsockopt+0x747/0x61a0 net/sctp/socket.c:4266
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978
 SYSC_setsockopt net/socket.c:1821 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1800
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f3f89946c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9
RDX: 0000000000000077 RSI: 0000000000000084 RDI: 0000000000000014
RBP: 0000000000000200 R08: 00000000000003c6 R09: 0000000000000000
R10: 00000000201b8000 R11: 0000000000000212 R12: 00000000006f10a0
R13: 00000000ffffffff R14: 00007f3f899476d4 R15: 0000000000000006
Code: 48 0f 44 da e8 d0 7a c1 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 60 98 92 85 49 89 c0 e8 d6 33 ab ff <0f> 0b 48 c7 c0 20 96 92 85 eb 96 48 c7 c0 60 96 92 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:76 [inline] RSP: ffff8801d875f5b0
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:276 RSP: ffff8801d875f5b0
---[ end trace d5d46abb47458195 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..