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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 ffff8881ecb0e00b by task syz-executor.0/21234

CPU: 0 PID: 21234 Comm: syz-executor.0 Not tainted 5.4.110-syzkaller-00108-g2c6775a89bc1 #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:2984 [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]
 kernel_sendmsg+0xf5/0x130 net/socket.c:678
 sock_no_sendpage+0x143/0x1b0 net/core/sock.c:2763
 kernel_sendpage net/socket.c:3764 [inline]
 sock_sendpage+0xd0/0x120 net/socket.c:936
 pipe_to_sendpage+0x23b/0x300 fs/splice.c:449
 splice_from_pipe_feed fs/splice.c:500 [inline]
 __splice_from_pipe+0x2d3/0x870 fs/splice.c:624
 splice_from_pipe fs/splice.c:659 [inline]
 generic_splice_sendpage+0x181/0x210 fs/splice.c:829
 do_splice_from fs/splice.c:848 [inline]
 do_splice fs/splice.c:1156 [inline]
 __do_sys_splice fs/splice.c:1433 [inline]
 __se_sys_splice+0x7a8/0x1b00 fs/splice.c:1413
 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:00007f561cc02188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466459
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000004bf9fb R08: 000000000004ffe0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007fffdfa42a1f R14: 00007f561cc02300 R15: 0000000000022000

Allocated by task 20539:
 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
 kmem_cache_alloc_trace+0x139/0x2b0 mm/slub.c:2848
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:690 [inline]
 alloc_super+0x56/0x750 fs/super.c:203
 sget+0x20e/0x4e0 fs/super.c:613
 mount_bdev+0xe3/0x340 fs/super.c:1390
 legacy_get_tree+0xde/0x170 fs/fs_context.c:647
 vfs_get_tree+0x83/0x260 fs/super.c:1547
 do_new_mount fs/namespace.c:2825 [inline]
 do_mount+0x19d0/0x2670 fs/namespace.c:3145
 ksys_mount+0xc2/0xf0 fs/namespace.c:3354
 __do_sys_mount fs/namespace.c:3368 [inline]
 __se_sys_mount fs/namespace.c:3365 [inline]
 __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3365
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 67:
 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
 process_one_work+0x679/0x1030 kernel/workqueue.c:2277
 worker_thread+0xa6f/0x1400 kernel/workqueue.c:2423
 kthread+0x30f/0x330 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881ecb0e000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 11 bytes inside of
 2048-byte region [ffff8881ecb0e000, ffff8881ecb0e800)
The buggy address belongs to the page:
page:ffffea0007b2c200 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0xffff8881ecb0d000 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 ffffea00079f4c08 ffffea0007a70608 ffff8881f5c0c000
raw: ffff8881ecb0d000 0000000000080003 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881ecb0df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881ecb0df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881ecb0e000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8881ecb0e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881ecb0e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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