BUG: KASAN: slab-out-of-bounds in xfrm_hash_rebuild+0xdbe/0xf00 net/xfrm/xfrm_policy.c:619
Read of size 2 at addr ffff8801d180fa34 by task kworker/1:2/1348

CPU: 1 PID: 1348 Comm: kworker/1:2 Not tainted 4.14.0-rc5-mm1+ #20
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:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 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:619
 process_one_work+0xbf0/0x1bc0 kernel/workqueue.c:2112
 worker_thread+0x223/0x1990 kernel/workqueue.c:2246
 kthread+0x38b/0x470 kernel/kthread.c:242
 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431

Allocated by task 3006:
 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:3712 [inline]
 __kmalloc+0x162/0x760 mm/slab.c:3721
 kmalloc include/linux/slab.h:504 [inline]
 sk_prot_alloc+0x101/0x2a0 net/core/sock.c:1469
 sk_alloc+0x89/0x700 net/core/sock.c:1523
 pfkey_create+0x2b2/0xae0 net/key/af_key.c:158
 __sock_create+0x4d4/0x850 net/socket.c:1261
 sock_create net/socket.c:1301 [inline]
 SYSC_socket net/socket.c:1331 [inline]
 SyS_socket+0xeb/0x200 net/socket.c:1311
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d180f500
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1332 bytes inside of
 2048-byte region [ffff8801d180f500, ffff8801d180fd00)
The buggy address belongs to the page:
page:ffffea0007460380 count:1 mapcount:0 mapping:ffff8801d180e400 index:0x0 compound_mapcount: 0
flags: 0x200000000008100(slab|head)
raw: 0200000000008100 ffff8801d180e400 0000000000000000 0000000100000003
raw: ffffea0007490720 ffff8801dac01948 ffff8801dac00c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d180f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d180f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d180fa00: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff8801d180fa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801d180fb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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