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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1181 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x272d/0x3210 net/key/af_key.c:1499
Read of size 5889 at addr ffff8801c5458ad8 by task syz-executor3/14172

CPU: 0 PID: 14172 Comm: syz-executor3 Not tainted 4.17.0-rc4+ #62
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+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:345 [inline]
 pfkey_msg2xfrm_state net/key/af_key.c:1181 [inline]
 pfkey_add+0x272d/0x3210 net/key/af_key.c:1499
 pfkey_process+0x7cc/0x8a0 net/key/af_key.c:2819
 pfkey_sendmsg+0x5f4/0x1050 net/key/af_key.c:3658
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x805/0x940 net/socket.c:2117
 __sys_sendmsg+0x115/0x270 net/socket.c:2155
 __compat_sys_sendmsg net/compat.c:756 [inline]
 __do_compat_sys_sendmsg net/compat.c:763 [inline]
 __se_compat_sys_sendmsg net/compat.c:760 [inline]
 __ia32_compat_sys_sendmsg+0x7a/0xb0 net/compat.c:760
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f7dcb9
RSP: 002b:00000000f5f790ac EFLAGS: 00000282 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000020000400
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 14172:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
 __kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137
 __alloc_skb+0x14d/0x780 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:987 [inline]
 pfkey_sendmsg+0x250/0x1050 net/key/af_key.c:3645
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x805/0x940 net/socket.c:2117
 __sys_sendmsg+0x115/0x270 net/socket.c:2155
 __compat_sys_sendmsg net/compat.c:756 [inline]
 __do_compat_sys_sendmsg net/compat.c:763 [inline]
 __se_compat_sys_sendmsg net/compat.c:760 [inline]
 __ia32_compat_sys_sendmsg+0x7a/0xb0 net/compat.c:760
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 12693:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 sctp_endpoint_destroy net/sctp/endpointola.c:281 [inline]
 sctp_endpoint_put+0x22d/0x2c0 net/sctp/endpointola.c:297
 sctp_endpoint_free+0x71/0x90 net/sctp/endpointola.c:240
 sctp_destroy_sock+0xe2/0x540 net/sctp/socket.c:4702
 sctp_v6_destroy_sock+0x15/0x20 net/sctp/socket.c:8762
 sk_common_release+0x6d/0x320 net/core/sock.c:3060
 sctp_close+0x4c7/0xa50 net/sctp/socket.c:1585
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:460
 sock_release+0x96/0x1b0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2469
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_32_irqs_on arch/x86/entry/common.c:338 [inline]
 do_fast_syscall_32+0xcc3/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

The buggy address belongs to the object at ffff8801c5458ac0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8801c5458ac0, ffff8801c5458cc0)
The buggy address belongs to the page:
page:ffffea0007151600 count:1 mapcount:0 mapping:ffff8801c54580c0 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c54580c0 0000000000000000 0000000100000006
raw: ffffea000717b6a0 ffffea0007153ca0 ffff8801da800940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c5458b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c5458c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c5458c80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8801c5458d00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801c5458d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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