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BUG: KASAN: slab-out-of-bounds in eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282
Read of size 2 at addr ffff8881a6a9540b by task syz-executor.4/1470

CPU: 1 PID: 1470 Comm: syz-executor.4 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:00007fe4899f3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000000000018 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffdc4b02d9f R14: 00007fe4899f3300 R15: 0000000000022000

Allocated by task 349:
 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]
 kmem_cache_alloc+0x115/0x290 mm/slub.c:2834
 getname_flags+0xba/0x640 fs/namei.c:141
 getname fs/namei.c:212 [inline]
 user_path_mountpoint_at+0x22/0x40 fs/namei.c:2822
 ksys_umount+0x162/0xfa0 fs/namespace.c:1686
 __do_sys_umount fs/namespace.c:1712 [inline]
 __se_sys_umount fs/namespace.c:1710 [inline]
 __x64_sys_umount+0x56/0x60 fs/namespace.c:1710
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 349:
 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]
 kmem_cache_free+0xb8/0x5f0 mm/slub.c:3088
 putname fs/namei.c:262 [inline]
 filename_mountpoint+0x4d7/0x690 fs/namei.c:2800
 ksys_umount+0x162/0xfa0 fs/namespace.c:1686
 __do_sys_umount fs/namespace.c:1712 [inline]
 __se_sys_umount fs/namespace.c:1710 [inline]
 __x64_sys_umount+0x56/0x60 fs/namespace.c:1710
 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 ffff8881a6a94400
 which belongs to the cache names_cache of size 4096
The buggy address is located 11 bytes to the right of
 4096-byte region [ffff8881a6a94400, ffff8881a6a95400)
The buggy address belongs to the page:
page:ffffea00069aa400 refcount:1 mapcount:0 mapping:ffff8881f5cfbb80 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cfbb80
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881a6a95300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881a6a95380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881a6a95400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff8881a6a95480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881a6a95500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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