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BUG: KASAN: use-after-free in __list_del_entry_valid+0xf1/0x100 lib/list_debug.c:51
Read of size 8 at addr ffff8881d778cb70 by task kworker/1:2/3433

CPU: 1 PID: 3433 Comm: kworker/1:2 Not tainted 4.20.0-rc6-next-20181210+ #164
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient neigh_periodic_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 print_address_description.cold.4+0x9/0x1ff mm/kasan/report.c:187
 kasan_report.cold.5+0x1b/0x39 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 __list_del_entry_valid+0xf1/0x100 lib/list_debug.c:51
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_init include/linux/list.h:159 [inline]
 neigh_mark_dead+0x13b/0x410 net/core/neighbour.c:125
 neigh_periodic_work+0x89a/0xc30 net/core/neighbour.c:905
 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 6014:
 save_stack+0x43/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482
 __do_kmalloc_node mm/slab.c:3671 [inline]
 __kmalloc_node+0x4d/0x70 mm/slab.c:3678
 kmalloc_node include/linux/slab.h:588 [inline]
 kvmalloc_node+0x65/0xf0 mm/util.c:416
 kvmalloc include/linux/mm.h:639 [inline]
 xt_alloc_table_info+0x42/0xa0 net/netfilter/x_tables.c:1181
 do_replace net/ipv6/netfilter/ip6_tables.c:1145 [inline]
 do_ip6t_set_ctl+0x2dc/0x64b net/ipv6/netfilter/ip6_tables.c:1684
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x7d/0xd0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x105/0x170 net/ipv6/ipv6_sockglue.c:945
 tcp_setsockopt+0x93/0xe0 net/ipv4/tcp.c:3068
 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2986
 __sys_setsockopt+0x1ba/0x3c0 net/socket.c:1903
 __do_sys_setsockopt net/socket.c:1914 [inline]
 __se_sys_setsockopt net/socket.c:1911 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6014:
 save_stack+0x43/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xcf/0x230 mm/slab.c:3804
 kvfree+0x61/0x70 mm/util.c:445
 xt_free_table_info+0x129/0x180 net/netfilter/x_tables.c:1201
 __do_replace+0x86a/0xad0 net/ipv6/netfilter/ip6_tables.c:1107
 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline]
 do_ip6t_set_ctl+0x49c/0x64b net/ipv6/netfilter/ip6_tables.c:1684
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x7d/0xd0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x105/0x170 net/ipv6/ipv6_sockglue.c:945
 tcp_setsockopt+0x93/0xe0 net/ipv4/tcp.c:3068
 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2986
 __sys_setsockopt+0x1ba/0x3c0 net/socket.c:1903
 __do_sys_setsockopt net/socket.c:1914 [inline]
 __se_sys_setsockopt net/socket.c:1911 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881d778c900
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 624 bytes inside of
 1024-byte region [ffff8881d778c900, ffff8881d778cd00)
The buggy address belongs to the page:
page:ffffea00075de300 count:1 mapcount:0 mapping:ffff8881da800ac0 index:0xffff8881d778db00 compound_mapcount: 0
flags: 0x2fffc0000010200(slab|head)
raw: 02fffc0000010200 ffffea0007367808 ffffea00072f3488 ffff8881da800ac0
raw: ffff8881d778db00 ffff8881d778c000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d778ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d778ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881d778cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff8881d778cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d778cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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