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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 ffff8801c9c111d0 by task syz-executor1/20910

CPU: 0 PID: 20910 Comm: syz-executor1 Not tainted 4.14.80+ #4
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 191:
 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]
 kobject_uevent_env+0x645/0xc40 lib/kobject_uevent.c:476
 kobject_synth_uevent+0x6ee/0x838 lib/kobject_uevent.c:205
 uevent_store+0x21/0x60 drivers/base/core.c:994
 dev_attr_store+0x57/0x80 drivers/base/core.c:714
 sysfs_kf_write+0x10a/0x160 fs/sysfs/file.c:141
 kernfs_fop_write+0x28b/0x440 fs/kernfs/file.c:316
 __vfs_write+0xf4/0x5c0 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:546
 SYSC_write fs/read_write.c:593 [inline]
 SyS_write+0xc2/0x1a0 fs/read_write.c:585
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 191:
 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]
 consume_skb+0xc9/0x330 net/core/skbuff.c:701
 netlink_broadcast_filtered+0x2b7/0xa30 net/netlink/af_netlink.c:1488
 kobject_uevent_env+0x793/0xc40 lib/kobject_uevent.c:492
 kobject_synth_uevent+0x6ee/0x838 lib/kobject_uevent.c:205
 uevent_store+0x21/0x60 drivers/base/core.c:994
 dev_attr_store+0x57/0x80 drivers/base/core.c:714
 sysfs_kf_write+0x10a/0x160 fs/sysfs/file.c:141
 kernfs_fop_write+0x28b/0x440 fs/kernfs/file.c:316
 __vfs_write+0xf4/0x5c0 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:546
 SYSC_write fs/read_write.c:593 [inline]
 SyS_write+0xc2/0x1a0 fs/read_write.c:585
 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 ffff8801c9c11140
 which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 144 bytes inside of
 224-byte region [ffff8801c9c11140, ffff8801c9c11220)
The buggy address belongs to the page:
page:ffffea0007270440 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000100(slab)
raw: 4000000000000100 0000000000000000 0000000000000000 00000001800c000c
raw: ffffea000747ca40 0000000900000002 ffff8801dab70200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c9c11080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff8801c9c11100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8801c9c11180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8801c9c11200: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c9c11280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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