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BUG: KASAN: slab-out-of-bounds in xfrm_hash_rebuild+0xdbe/0xf00 net/xfrm/xfrm_policy.c:618
Read of size 2 at addr ffff8801a53371e4 by task kworker/0:1/24

CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.15.0-rc6+ #245
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events xfrm_hash_rebuild
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
 xfrm_hash_rebuild+0xdbe/0xf00 net/xfrm/xfrm_policy.c:618
 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112
 worker_thread+0x223/0x1990 kernel/workqueue.c:2246
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524

Allocated by task 4177:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3708 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3717
 kmalloc include/linux/slab.h:504 [inline]
 sk_prot_alloc+0x101/0x2a0 net/core/sock.c:1469
 sk_alloc+0x105/0x1410 net/core/sock.c:1523
 pfkey_create+0x2b2/0xae0 net/key/af_key.c:158
 __sock_create+0x4d4/0x850 net/socket.c:1265
 sock_create net/socket.c:1305 [inline]
 SYSC_socket net/socket.c:1335 [inline]
 SyS_socket+0xeb/0x1d0 net/socket.c:1315
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801a5336cc0
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1316 bytes inside of
 2048-byte region [ffff8801a5336cc0, ffff8801a53374c0)
The buggy address belongs to the page:
page:00000000cf032f3b count:1 mapcount:0 mapping:00000000c063ed4a index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801a5336440 0000000000000000 0000000100000003
raw: ffffea000694cd20 ffffea000694ce20 ffff8801dac00c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801a5337080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801a5337100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801a5337180: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                       ^
 ffff8801a5337200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801a5337280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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