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BUG: KASAN: slab-out-of-bounds in ____bpf_clone_redirect net/core/filter.c:1767 [inline]
BUG: KASAN: slab-out-of-bounds in bpf_clone_redirect+0x29a/0x2b0 net/core/filter.c:1758
Read of size 8 at addr ffff8801c4ebb9d0 by task syz-executor4/22874

CPU: 0 PID: 22874 Comm: syz-executor4 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
netlink: 17 bytes leftover after parsing attributes in process `syz-executor0'.

Allocated by task 22869:
 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]
 nlmsg_new include/net/netlink.h:511 [inline]
 netlink_ack+0x228/0x980 net/netlink/af_netlink.c:2359
 netlink_rcv_skb+0x2b4/0x390 net/netlink/af_netlink.c:2438
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:635
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x46d/0x620 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x664/0xbe0 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:645 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:655
 ___sys_sendmsg+0x741/0x890 net/socket.c:2061
 __sys_sendmsg+0xca/0x170 net/socket.c:2095
 SYSC_sendmsg net/socket.c:2106 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2102
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 7:
 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
 __kfree_skb net/core/skbuff.c:642 [inline]
 kfree_skb+0xd0/0x340 net/core/skbuff.c:659
 skb_queue_purge+0x14/0x30 net/core/skbuff.c:2849
 netlink_sock_destruct+0xf9/0x250 net/netlink/af_netlink.c:371
 __sk_destruct+0x4f/0x5a0 net/core/sock.c:1558
 sk_destruct+0x5d/0x70 net/core/sock.c:1593
 __sk_free+0x4a/0x220 net/core/sock.c:1601
 sk_free+0x2c/0x40 net/core/sock.c:1612
 deferred_put_nlk_sk+0xf1/0x260 net/netlink/af_netlink.c:711
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2691 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2945 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2912 [inline]
 rcu_process_callbacks+0x54d/0xee0 kernel/rcu/tree.c:2929
 __do_softirq+0x215/0x997 kernel/softirq.c:288

The buggy address belongs to the object at ffff8801c4ebb8c0
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 48 bytes to the right of
 224-byte region [ffff8801c4ebb8c0, ffff8801c4ebb9a0)
The buggy address belongs to the page:
page:ffffea000713aec0 count:1 mapcount:0 mapping:          (null) index:0xffff8801c4ebb280
flags: 0x4000000000000100(slab)
raw: 4000000000000100 0000000000000000 ffff8801c4ebb280 00000001800c0009
raw: ffffea00071d8680 0000000a0000000a ffff8801dab70200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c4ebb880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801c4ebb900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801c4ebb980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
                                                 ^
 ffff8801c4ebba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c4ebba80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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