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BUG: KASAN: slab-out-of-bounds in ip6_dst_lookup_tail+0x196a/0x1b30 net/ipv6/ip6_output.c:1010
Read of size 8 at addr ffff88809eef18bf by task syz-executor.0/2327

CPU: 0 PID: 2327 Comm: syz-executor.0 Not tainted 5.2.0-rc1+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188
 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 kasan_report+0x12/0x20 mm/kasan/common.c:614
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 ip6_dst_lookup_tail+0x196a/0x1b30 net/ipv6/ip6_output.c:1010
 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1094
 ip6_datagram_dst_update+0x5d8/0xc20 net/ipv6/datagram.c:91
 ip6_datagram_release_cb net/ipv6/datagram.c:132 [inline]
 ip6_datagram_release_cb+0x4ed/0x550 net/ipv6/datagram.c:116
 release_sock+0xba/0x1c0 net/core/sock.c:2940
 udpv6_destroy_sock+0x29/0x150 net/ipv6/udp.c:1546
 sk_common_release+0x6b/0x330 net/core/sock.c:3151
 udp_lib_close+0x16/0x20 include/net/udp.h:206
 inet_release+0xff/0x1e0 net/ipv4/af_inet.c:432
 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:474
 __sock_release+0xce/0x2a0 net/socket.c:607
 sock_close+0x1b/0x30 net/socket.c:1279
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x412f61
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffc920b9350 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000412f61
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff
R10: 00007ffc920b9430 R11: 0000000000000293 R12: 0000000000760878
R13: 00000000000a24a6 R14: 00000000000a24d3 R15: 000000000075bfcc

Allocated by task 8843:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc mm/slab.c:3326 [inline]
 kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3488
 dst_alloc+0x10e/0x200 net/core/dst.c:93
 ip6_dst_alloc+0x34/0xa0 net/ipv6/route.c:356
 icmp6_dst_alloc+0x1a9/0x660 net/ipv6/route.c:2800
 ndisc_send_skb+0xfc1/0x14a0 net/ipv6/ndisc.c:488
 ndisc_send_ns+0x3a9/0x850 net/ipv6/ndisc.c:650
 rt6_probe_deferred+0xe3/0x1a0 net/ipv6/route.c:543
 process_one_work+0x989/0x1790 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x354/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 16:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459
 __cache_free mm/slab.c:3432 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3698
 dst_destroy+0x29e/0x3c0 net/core/dst.c:129
 dst_destroy_rcu+0x16/0x19 net/core/dst.c:142
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2092 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline]
 rcu_core+0xba5/0x1500 kernel/rcu/tree.c:2291
 __do_softirq+0x25c/0x94c kernel/softirq.c:293

The buggy address belongs to the object at ffff88809eef1780
 which belongs to the cache ip6_dst_cache of size 224
The buggy address is located 95 bytes to the right of
 224-byte region [ffff88809eef1780, ffff88809eef1860)
The buggy address belongs to the page:
page:ffffea00027bbc40 refcount:1 mapcount:0 mapping:ffff88809b183b40 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000263c2c8 ffffea00025fe108 ffff88809b183b40
raw: 0000000000000000 ffff88809eef1000 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809eef1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809eef1800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff88809eef1880: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                                        ^
 ffff88809eef1900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809eef1980: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
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