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netlink: 'syz-executor0': attribute type 1 has an invalid length.
BUG: KASAN: slab-out-of-bounds in erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
Read of size 2 at addr ffff8801c30b878b by task syz-executor5/22593

CPU: 1 PID: 22593 Comm: syz-executor5 Not tainted 4.15.0-rc8+ #203
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
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440
 erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
 __netdev_start_xmit include/linux/netdevice.h:4053 [inline]
 netdev_start_xmit include/linux/netdevice.h:4062 [inline]
 packet_direct_xmit+0x3ad/0x790 net/packet/af_packet.c:267
 packet_snd net/packet/af_packet.c:2944 [inline]
 packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 SYSC_sendto+0x361/0x5c0 net/socket.c:1721
 SyS_sendto+0x40/0x50 net/socket.c:1689
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ef9
RSP: 002b:00007fd57a67cc58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ef9
RDX: 0000000000000000 RSI: 0000000020011000 RDI: 0000000000000013
RBP: 000000000000059c R08: 0000000020008000 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f7740
R13: 00000000ffffffff R14: 00007fd57a67d6d4 R15: 0000000000000000

Allocated by task 22278:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
 kmem_cache_zalloc include/linux/slab.h:678 [inline]
 get_empty_filp+0xfb/0x4f0 fs/file_table.c:123
 path_openat+0xed/0x3530 fs/namei.c:3496
 do_filp_open+0x25b/0x3b0 fs/namei.c:3554
 do_sys_open+0x502/0x6d0 fs/open.c:1059
 SYSC_open fs/open.c:1077 [inline]
 SyS_open+0x2d/0x40 fs/open.c:1072
 entry_SYSCALL_64_fastpath+0x29/0xa0

Freed by task 7:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3488 [inline]
 kmem_cache_free+0x83/0x2a0 mm/slab.c:3746
 file_free_rcu+0x5c/0x70 fs/file_table.c:50
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2758 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
 rcu_process_callbacks+0xd6c/0x17f0 kernel/rcu/tree.c:2996
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285

The buggy address belongs to the object at ffff8801c30b8580
 which belongs to the cache filp of size 456
The buggy address is located 67 bytes to the right of
 456-byte region [ffff8801c30b8580, ffff8801c30b8748)
The buggy address belongs to the page:
page:ffffea00070c2e00 count:1 mapcount:0 mapping:ffff8801c30b8080 index:0xffff8801c30b8800
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c30b8080 ffff8801c30b8800 0000000100000005
raw: ffffea00074881e0 ffffea000758f6e0 ffff8801dae2c180 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c30b8680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c30b8700: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
>ffff8801c30b8780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff8801c30b8800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c30b8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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