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BUG: KASAN: slab-out-of-bounds in bpf_skb_proto_xlat net/core/filter.c:2150 [inline]
BUG: KASAN: slab-out-of-bounds in ____bpf_skb_change_proto net/core/filter.c:2188 [inline]
BUG: KASAN: slab-out-of-bounds in bpf_skb_change_proto+0xd7d/0x1100 net/core/filter.c:2163
Read of size 2 at addr ffff8801c7d639f8 by task syz-executor2/5384

CPU: 1 PID: 5384 Comm: syz-executor2 Not tainted 4.14.73+ #13
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 print_address_description+0x60/0x22b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
 bpf_skb_proto_xlat net/core/filter.c:2150 [inline]
 ____bpf_skb_change_proto net/core/filter.c:2188 [inline]
 bpf_skb_change_proto+0xd7d/0x1100 net/core/filter.c:2163
 ___bpf_prog_run+0x248e/0x5c70 kernel/bpf/core.c:1012

Allocated by task 1857:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.1+0x4f/0xd0 mm/kasan/kasan.c:551
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slub.c:2723 [inline]
 slab_alloc mm/slub.c:2731 [inline]
 kmem_cache_alloc+0xe4/0x2b0 mm/slub.c:2736
 __build_skb+0x30/0x2c0 net/core/skbuff.c:281
 __napi_alloc_skb+0x1ca/0x300 net/core/skbuff.c:482
 napi_alloc_skb include/linux/skbuff.h:2655 [inline]
 page_to_skb.isra.18+0xa3/0x690 drivers/net/virtio_net.c:321
 receive_mergeable drivers/net/virtio_net.c:714 [inline]
 receive_buf+0x1721/0x42c0 drivers/net/virtio_net.c:819
 virtnet_receive drivers/net/virtio_net.c:1093 [inline]
 virtnet_poll+0x2af/0x910 drivers/net/virtio_net.c:1174
 napi_poll net/core/dev.c:5569 [inline]
 net_rx_action+0x371/0xce0 net/core/dev.c:5635
 __do_softirq+0x215/0x997 kernel/softirq.c:288

Freed by task 1857:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:524
 slab_free_hook mm/slub.c:1389 [inline]
 slab_free_freelist_hook mm/slub.c:1410 [inline]
 slab_free mm/slub.c:2966 [inline]
 kmem_cache_free+0x12d/0x350 mm/slub.c:2988
 kfree_skbmem+0x9e/0x100 net/core/skbuff.c:582
 tcp_rcv_established+0xd8d/0x1660 net/ipv4/tcp_input.c:5472
 tcp_v4_do_rcv+0x55f/0x6f0 net/ipv4/tcp_ipv4.c:1464
 tcp_v4_rcv+0x26ca/0x3240 net/ipv4/tcp_ipv4.c:1745
 ip_local_deliver_finish+0x3f1/0xaa0 net/ipv4/ip_input.c:216
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip_local_deliver+0x374/0x450 net/ipv4/ip_input.c:257
 dst_input include/net/dst.h:465 [inline]
 ip_rcv_finish+0x5cc/0x1490 net/ipv4/ip_input.c:397
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip_rcv+0xa19/0x1028 net/ipv4/ip_input.c:493
 __netif_receive_skb_core+0x149d/0x2d10 net/core/dev.c:4455
 __netif_receive_skb+0x58/0x1f0 net/core/dev.c:4493
 netif_receive_skb_internal+0xfc/0x5e0 net/core/dev.c:4566
 napi_skb_finish net/core/dev.c:4927 [inline]
 napi_gro_receive+0x20e/0x410 net/core/dev.c:4958
 receive_buf+0xa55/0x42c0 drivers/net/virtio_net.c:847
 virtnet_receive drivers/net/virtio_net.c:1093 [inline]
 virtnet_poll+0x2af/0x910 drivers/net/virtio_net.c:1174
 napi_poll net/core/dev.c:5569 [inline]
 net_rx_action+0x371/0xce0 net/core/dev.c:5635
 __do_softirq+0x215/0x997 kernel/softirq.c:288

The buggy address belongs to the object at ffff8801c7d638c0
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 88 bytes to the right of
 224-byte region [ffff8801c7d638c0, ffff8801c7d639a0)
The buggy address belongs to the page:
page:ffffea00071f58c0 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000100(slab)
raw: 4000000000000100 0000000000000000 0000000000000000 00000001800c000c
raw: dead000000000100 dead000000000200 ffff8801dab70200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c7d63880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801c7d63900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801c7d63980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff8801c7d63a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c7d63a80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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