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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:1220 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x1778/0x3210 net/key/af_key.c:1499
Read of size 2976 at addr ffff8801b74d4380 by task syz-executor2/7135

CPU: 0 PID: 7135 Comm: syz-executor2 Not tainted 4.17.0-rc3+ #28
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:1220 [inline]
 pfkey_add+0x1778/0x3210 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
 __do_sys_sendmsg net/socket.c:2164 [inline]
 __se_sys_sendmsg net/socket.c:2162 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455979
RSP: 002b:00007f1922a74c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1922a756d4 RCX: 0000000000455979
RDX: 0000000000000000 RSI: 0000000020b6dfc8 RDI: 0000000000000016
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000538 R14: 00000000006fbde0 R15: 0000000000000000

Allocated by task 7135:
 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
 __do_sys_sendmsg net/socket.c:2164 [inline]
 __se_sys_sendmsg net/socket.c:2162 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 0:
 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
 skb_free_head+0x99/0xc0 net/core/skbuff.c:550
 skb_release_data+0x690/0x860 net/core/skbuff.c:570
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 kfree_skb+0x195/0x560 net/core/skbuff.c:659
 skb_queue_purge+0x19/0x40 net/core/skbuff.c:2838
 netlink_sock_destruct+0x170/0x3f0 net/netlink/af_netlink.c:402
 __sk_destruct+0xff/0xa40 net/core/sock.c:1566
 sk_destruct+0x78/0x90 net/core/sock.c:1601
 __sk_free+0x22e/0x340 net/core/sock.c:1612
 sk_free+0x42/0x50 net/core/sock.c:1623
 deferred_put_nlk_sk+0x161/0x350 net/netlink/af_netlink.c:741
 __rcu_reclaim kernel/rcu/rcu.h:178 [inline]
 rcu_do_batch kernel/rcu/tree.c:2675 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
 rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285

The buggy address belongs to the object at ffff8801b74d4340
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 64 bytes inside of
 512-byte region [ffff8801b74d4340, ffff8801b74d4540)
The buggy address belongs to the page:
page:ffffea0006dd3500 count:1 mapcount:0 mapping:ffff8801b74d40c0 index:0xffff8801b74d4d40
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801b74d40c0 ffff8801b74d4d40 0000000100000005
raw: ffffea0006e5b360 ffffea000740b0a0 ffff8801da800940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b74d4400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b74d4480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801b74d4500: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8801b74d4580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8801b74d4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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