netlink: 24 bytes leftover after parsing attributes in process `syz-executor2'.
device syz6 entered promiscuous mode
------------[ cut here ]------------
unexpected usercopy exposure with bad or missing whitelist with SLAB object 'skbuff_head_cache' (offset 64, size 16)
WARNING: CPU: 0 PID: 18490 at mm/slab.c:4426 __check_heap_object+0xef/0x100 mm/slab.c:4424
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 18490 Comm: syz-executor6 Not tainted 4.15.0-rc7-mm1+ #53
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+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1102
RIP: 0010:__check_heap_object+0xef/0x100 mm/slab.c:4424
RSP: 0018:ffff8801d9757748 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: 1ffff1003b2eaef1 RCX: ffffffff815a254e
RDX: 0000000000000413 RSI: ffffc90003cc2000 RDI: 0000000000000212
RBP: ffff8801d9757750 R08: ffffffff86938df8 R09: 0000000000000000
R10: 00000000000003e6 R11: 0000000000000000 R12: 0000000000000010
R13: ffff8801d222e6c0 R14: ffffea0007488b80 R15: ffffea0007488b80
 check_heap_object mm/usercopy.c:234 [inline]
 __check_object_size+0x301/0x530 mm/usercopy.c:257
 check_object_size include/linux/thread_info.h:112 [inline]
 check_copy_size include/linux/thread_info.h:145 [inline]
 copy_to_user include/linux/uaccess.h:154 [inline]
 put_cmsg+0x233/0x3f0 net/core/scm.c:242
 sock_recv_errqueue+0x200/0x3e0 net/core/sock.c:2913
 packet_recvmsg+0xb2e/0x17a0 net/packet/af_packet.c:3296
 sock_recvmsg_nosec net/socket.c:801 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:808
 ___sys_recvmsg+0x2a4/0x640 net/socket.c:2177
 __sys_recvmsg+0xe2/0x210 net/socket.c:2222
 SYSC_recvmsg net/socket.c:2234 [inline]
 SyS_recvmsg+0x2d/0x50 net/socket.c:2229
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ac9
RSP: 002b:00007f6aeff93c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000002000 RSI: 000000002067cfc8 RDI: 0000000000000016
RBP: 0000000000000601 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f70b8
R13: 00000000ffffffff R14: 00007f6aeff946d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..