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unexpected usercopy exposure with bad or missing whitelist with SLAB object 'skbuff_head_cache' (offset 64, size 16)
WARNING: CPU: 0 PID: 19641 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: 19641 Comm: syz-executor4 Not tainted 4.15.0-rc7-next-20180111+ #94
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:ffff8801ccedf5a8 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: 1ffff100399dbebd RCX: ffffffff815a613e
RDX: 0000000000001fd8 RSI: ffffc90003235000 RDI: 1ffff100399dbe70
RBP: ffff8801ccedf5b0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000006e6 R11: 0000000000000000 R12: 0000000000000010
R13: ffff8801c1738b80 R14: ffffea000705ce00 R15: ffffea000705ce00
 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_recvmmsg+0x2a9/0xaf0 net/socket.c:2285
 SYSC_recvmmsg net/socket.c:2366 [inline]
 SyS_recvmmsg+0xc4/0x160 net/socket.c:2350
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ac9
RSP: 002b:00007f88f0806c58 EFLAGS: 00000212 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000000007 RSI: 000000002008b000 RDI: 0000000000000013
RBP: 000000000000001c R08: 0000000020000000 R09: 0000000000000000
R10: 0000000000002000 R11: 0000000000000212 R12: 00000000006ee340
R13: 00000000ffffffff R14: 00007f88f08076d4 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..