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BUG: KASAN: use-after-free in eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282
Read of size 2 at addr ffff8881b5b58c0b by task syz-executor.5/30106

CPU: 0 PID: 30106 Comm: syz-executor.5 Tainted: G        W         5.4.111-syzkaller-00138-g3c5dbcf40ba8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x24e lib/dump_stack.c:118
 print_address_description+0x9b/0x650 mm/kasan/report.c:384
 __kasan_report+0x182/0x260 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:641
 eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282
 dev_parse_header_protocol include/linux/netdevice.h:3016 [inline]
 virtio_net_hdr_to_skb+0x6de/0xd70 include/linux/virtio_net.h:83
 packet_snd net/packet/af_packet.c:2976 [inline]
 packet_sendmsg+0x483a/0x6780 net/packet/af_packet.c:3013
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg net/socket.c:658 [inline]
 sock_write_iter+0x330/0x450 net/socket.c:990
 call_write_iter include/linux/fs.h:1971 [inline]
 new_sync_write fs/read_write.c:483 [inline]
 __vfs_write+0x5ec/0x780 fs/read_write.c:496
 vfs_write+0x212/0x4e0 fs/read_write.c:558
 ksys_write+0x186/0x2b0 fs/read_write.c:611
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5d1284a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 000000000000fdef RSI: 0000000020000840 RDI: 0000000000000005
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd1124ce9f R14: 00007f5d1284a300 R15: 0000000000022000

Allocated by task 27975:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:517
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2821 [inline]
 slab_alloc mm/slub.c:2829 [inline]
 __kmalloc_track_caller+0x13a/0x2e0 mm/slub.c:4439
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xaf/0x4d0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1057 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1175 [inline]
 netlink_sendmsg+0x748/0xd40 net/netlink/af_netlink.c:1893
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg net/socket.c:658 [inline]
 __sys_sendto+0x4f1/0x6c0 net/socket.c:1953
 __do_sys_sendto net/socket.c:1965 [inline]
 __se_sys_sendto net/socket.c:1961 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:1961
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 27975:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:333 [inline]
 __kasan_slab_free+0x18a/0x240 mm/kasan/common.c:475
 slab_free_hook mm/slub.c:1454 [inline]
 slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492
 slab_free mm/slub.c:3072 [inline]
 kfree+0xe0/0x660 mm/slub.c:4061
 skb_release_all net/core/skbuff.c:675 [inline]
 __kfree_skb+0x55/0x170 net/core/skbuff.c:689
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x86d/0x9f0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x9ab/0xd40 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg net/socket.c:658 [inline]
 __sys_sendto+0x4f1/0x6c0 net/socket.c:1953
 __do_sys_sendto net/socket.c:1965 [inline]
 __se_sys_sendto net/socket.c:1961 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:1961
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8881b5b58c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 11 bytes inside of
 512-byte region [ffff8881b5b58c00, ffff8881b5b58e00)
The buggy address belongs to the page:
page:ffffea0006d6d600 refcount:1 mapcount:0 mapping:ffff8881f5c02500 index:0xffff8881b5b5ac00 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 ffffea0006ab9708 ffffea000725d508 ffff8881f5c02500
raw: ffff8881b5b5ac00 0000000000100002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881b5b58b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881b5b58b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881b5b58c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8881b5b58c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881b5b58d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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