==================================================================
BUG: KASAN: use-after-free in ____bpf_clone_redirect net/core/filter.c:1767 [inline]
BUG: KASAN: use-after-free in bpf_clone_redirect+0x29a/0x2b0 net/core/filter.c:1758
Read of size 8 at addr ffff8801c13a4bd0 by task syz-executor2/5323

CPU: 0 PID: 5323 Comm: syz-executor2 Not tainted 4.14.78+ #26
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_clone_redirect net/core/filter.c:1767 [inline]
 bpf_clone_redirect+0x29a/0x2b0 net/core/filter.c:1758
 ___bpf_prog_run+0x248e/0x5c70 kernel/bpf/core.c:1012

Allocated by task 5316:
 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
 kmem_cache_alloc_node include/linux/slab.h:361 [inline]
 __alloc_skb+0xd8/0x550 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 __tcp_send_ack.part.9+0x64/0x570 net/ipv4/tcp_output.c:3576
 __tcp_send_ack net/ipv4/tcp_output.c:3603 [inline]
 tcp_send_ack+0x6f/0x90 net/ipv4/tcp_output.c:3603
 __tcp_ack_snd_check+0xf6/0x380 net/ipv4/tcp_input.c:5126
 tcp_ack_snd_check net/ipv4/tcp_input.c:5139 [inline]
 tcp_rcv_state_process+0xd93/0x48d9 net/ipv4/tcp_input.c:6146
 tcp_v4_do_rcv+0x2e8/0x6f0 net/ipv4/tcp_ipv4.c:1488
 sk_backlog_rcv include/net/sock.h:902 [inline]
 __release_sock+0x135/0x350 net/core/sock.c:2261
 release_sock+0x54/0x1b0 net/core/sock.c:2773
 inet_shutdown+0x1af/0x350 net/ipv4/af_inet.c:870
 SYSC_shutdown net/socket.c:1916 [inline]
 SyS_shutdown+0xf5/0x1a0 net/socket.c:1907
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 5316:
 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_data_queue+0x133b/0x3190 net/ipv4/tcp_input.c:4656
 tcp_rcv_state_process+0xc84/0x48d9 net/ipv4/tcp_input.c:6138
 tcp_v4_do_rcv+0x2e8/0x6f0 net/ipv4/tcp_ipv4.c:1488
 sk_backlog_rcv include/net/sock.h:902 [inline]
 __release_sock+0x135/0x350 net/core/sock.c:2261
 release_sock+0x54/0x1b0 net/core/sock.c:2773
 inet_shutdown+0x1af/0x350 net/ipv4/af_inet.c:870
 SYSC_shutdown net/socket.c:1916 [inline]
 SyS_shutdown+0xf5/0x1a0 net/socket.c:1907
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801c13a4b40
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 144 bytes inside of
 224-byte region [ffff8801c13a4b40, ffff8801c13a4c20)
The buggy address belongs to the page:
page:ffffea000704e900 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000100(slab)
raw: 4000000000000100 0000000000000000 0000000000000000 00000001800c000c
raw: dead000000000100 dead000000000200 ffff8801d6770200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c13a4a80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8801c13a4b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8801c13a4b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8801c13a4c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c13a4c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================