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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 ffff8801c9eb4624 by task kworker/1:1/23

CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 4.15.0-rc5+ #173
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:515

Allocated by task 3508:
 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:1471
 sk_alloc+0x105/0x1440 net/core/sock.c:1525
 pfkey_create+0x2b2/0xae0 net/key/af_key.c:158
 __sock_create+0x4d4/0x850 net/socket.c:1257
 sock_create net/socket.c:1297 [inline]
 SYSC_socket net/socket.c:1327 [inline]
 SyS_socket+0xeb/0x1d0 net/socket.c:1307
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 3493:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3488 [inline]
 kfree+0xd6/0x260 mm/slab.c:3803
 skb_free_head+0x74/0xb0 net/core/skbuff.c:550
 skb_release_data+0x58c/0x790 net/core/skbuff.c:570
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb+0x15/0x20 net/core/skbuff.c:641
 sk_wmem_free_skb include/net/sock.h:1416 [inline]
 tcp_rtx_queue_unlink_and_free include/net/tcp.h:1673 [inline]
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3113 [inline]
 tcp_ack+0x1b8f/0x5010 net/ipv4/tcp_input.c:3596
 tcp_rcv_established+0x10bb/0x1be0 net/ipv4/tcp_input.c:5376
 tcp_v4_do_rcv+0x2ab/0x7d0 net/ipv4/tcp_ipv4.c:1468
 sk_backlog_rcv include/net/sock.h:907 [inline]
 __release_sock+0x124/0x360 net/core/sock.c:2274
 release_sock+0xa4/0x2a0 net/core/sock.c:2789
 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1466
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 sock_write_iter+0x31a/0x5d0 net/socket.c:907
 call_write_iter include/linux/fs.h:1772 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x23/0x9a

The buggy address belongs to the object at ffff8801c9eb4100
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1316 bytes inside of
 2048-byte region [ffff8801c9eb4100, ffff8801c9eb4900)
The buggy address belongs to the page:
page:00000000b5666cba count:1 mapcount:0 mapping:0000000001f39d9e index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801c9eb4100 0000000000000000 0000000100000003
raw: ffffea00073005a0 ffffea00070bd020 ffff8801dac00c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c9eb4500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c9eb4580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c9eb4600: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff8801c9eb4680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c9eb4700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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