------------[ cut here ]------------
kernel BUG at mm/usercopy.c:72!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3977 Comm: syz-executor6 Not tainted 4.15.0-rc5+ #171
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x3a2/0x4f0 mm/usercopy.c:264
RSP: 0018:ffff8801c2bbf5f8 EFLAGS: 00010282
RAX: 0000000000000061 RBX: ffffffff8592bb60 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90003cb3000 RDI: ffffed0038577eb3
RBP: ffff8801c2bbf6e8 R08: 1ffff10038577e41 R09: 0000000000000000
R10: 000000004afcb911 R11: 0000000000000000 R12: ffffffff8592bb20
R13: ffff8801ce492510 R14: 00000000000003e4 R15: ffffea0007392480
FS:  00007f0e30286700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'.
netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'.
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000205d1000 CR3: 00000001d478f005 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
 xfrm_user_policy+0xf7/0x8c0 net/xfrm/xfrm_state.c:2062
 do_ip_setsockopt.isra.12+0xfd9/0x3160 net/ipv4/ip_sockglue.c:1161
 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1248
 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2388
 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+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f0e30285c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000000011 RSI: 0000000000000000 RDI: 0000000000000018
RBP: 000000000000057e R08: 00000000000003e4 R09: 0000000000000000
R10: 0000000020561000 R11: 0000000000000212 R12: 00000000006f6470
R13: 00000000ffffffff R14: 00007f0e302866d4 R15: 0000000000000000
Code: 48 0f 44 da e8 70 5b c0 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 20 bc 92 85 49 89 c0 e8 e6 10 aa ff <0f> 0b 48 c7 c0 e0 b9 92 85 eb 96 48 c7 c0 20 ba 92 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801c2bbf5f8
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801c2bbf5f8
---[ end trace d0ba21a768fb6633 ]---