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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 ffff8881e562a00b by task syz-executor.5/9614

CPU: 1 PID: 9614 Comm: syz-executor.5 Not tainted 5.4.111-syzkaller-00141-gce6a5172613f #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:00007f60c69f4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000000000018 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd8ef8085f R14: 00007f60c69f4300 R15: 0000000000022000

Allocated by task 9384:
 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]
 nlmsg_new include/net/netlink.h:888 [inline]
 audit_buffer_alloc kernel/audit.c:1693 [inline]
 audit_log_start+0x49b/0x9a0 kernel/audit.c:1806
 audit_seccomp+0x5f/0x1f0 kernel/auditsc.c:2611
 seccomp_log kernel/seccomp.c:967 [inline]
 __seccomp_filter+0x10f7/0x16b0 kernel/seccomp.c:1212
 syscall_trace_enter+0x599/0xa50 arch/x86/entry/common.c:117
 do_syscall_64+0x69/0x1e0 arch/x86/entry/common.c:286
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 22:
 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
 kauditd_send_queue+0x196/0x270 kernel/audit.c:728
 kauditd_thread+0x3d6/0x6e0 kernel/audit.c:854
 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 ffff8881e562a000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 11 bytes inside of
 2048-byte region [ffff8881e562a000, ffff8881e562a800)
The buggy address belongs to the page:
page:ffffea0007958a00 refcount:1 mapcount:0 mapping:ffff8881f5c0c000 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c0c000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881e5629f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881e5629f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881e562a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8881e562a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e562a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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