netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'.
usercopy: kernel memory overwrite attempt detected to 00000000e69dc5e2 (kmalloc-1024) (992 bytes)
------------[ 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: 0 PID: 19818 Comm: syz-executor4 Not tainted 4.15.0-rc5+ #170
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:ffff8801bc03f920 EFLAGS: 00010286
RAX: 0000000000000061 RBX: ffffffff85529380 RCX: 0000000000000000
RDX: 0000000000000061 RSI: ffffc90002d88000 RDI: ffffed0037807f18
RBP: ffff8801bc03fa10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000c0686a5c R11: 0000000000000000 R12: ffffffff85529340
R13: ffff8801ce8d64d0 R14: 00000000000003e0 R15: ffffea00073a3580
FS:  00007f16e5824700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001e50cd8 CR3: 00000001c2554002 CR4: 00000000001606f0
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]
 ___sys_sendmsg+0x59c/0x8b0 net/socket.c:1995
 __sys_sendmmsg+0x1ee/0x620 net/socket.c:2108
 SYSC_sendmmsg net/socket.c:2139 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2134
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f16e5823c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f16e5824700 RCX: 0000000000452ac9
RDX: 0000000000000004 RSI: 000000002065a000 RDI: 0000000000000015
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000800 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f16e58249c0 R15: 0000000000000000
Code: 48 0f 44 da e8 00 a0 c1 ff 48 8b 85 28 ff ff ff 4d 89 f1 4c 89 e9 4c 89 e2 48 89 de 48 c7 c7 40 94 52 85 49 89 c0 e8 c6 59 ab ff <0f> 0b 48 c7 c0 00 92 52 85 eb 96 48 c7 c0 40 92 52 85 eb 8d 48 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff8801bc03f920
RIP: __check_object_size+0x3a2/0x4f0 mm/usercopy.c:264 RSP: ffff8801bc03f920
---[ end trace b6476f694811c05a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..