==================================================================
BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x145d/0x3220 net/key/af_key.c:1506
Read of size 4987 at addr ffff8801d1bf4298 by task syz-executor4/15608

CPU: 0 PID: 15608 Comm: syz-executor4 Not tainted 4.4.135-ge75204c #53
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 62c0ed8d28b54013 ffff8801bd15f6c0 ffffffff81e0ed0d
 ffffea000746fd00 ffff8801d1bf4298 0000000000000000 ffff8801d1bf4480
 ffff8801d1bf4280 ffff8801bd15f6f8 ffffffff81515946 ffff8801d1bf4298
Call Trace:
 [<ffffffff81e0ed0d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e0ed0d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81515946>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff81515c65>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81515c65>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814f86df>] check_memory_region_inline mm/kasan/kasan.c:325 [inline]
 [<ffffffff814f86df>] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:332
 [<ffffffff814f8c23>] memcpy+0x23/0x50 mm/kasan/kasan.c:367
 [<ffffffff835876ad>] pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline]
 [<ffffffff835876ad>] pfkey_add+0x145d/0x3220 net/key/af_key.c:1506
 [<ffffffff8358bd41>] pfkey_process+0x671/0x740 net/key/af_key.c:2834
 [<ffffffff8358d576>] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678
 [<ffffffff82f1e15c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1e15c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1fc25>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f21cc6>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300baea>] C_SYSC_sendmsg net/compat.c:722 [inline]
 [<ffffffff8300baea>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:720
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c40aa>] sysenter_flags_fixed+0xd/0x17

Allocated by task 15608:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8803>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8ae7>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8ae7>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f92c4>] kasan_krealloc+0x64/0x80 mm/kasan/kasan.c:654
 [<ffffffff814f24ba>] ksize+0x8a/0xf0 mm/slub.c:3727
 [<ffffffff82f38053>] __alloc_skb+0x133/0x600 net/core/skbuff.c:237
 [<ffffffff8358d32e>] alloc_skb include/linux/skbuff.h:815 [inline]
 [<ffffffff8358d32e>] pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665
 [<ffffffff82f1e15c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1e15c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1fc25>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f21cc6>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300baea>] C_SYSC_sendmsg net/compat.c:722 [inline]
 [<ffffffff8300baea>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:720
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c40aa>] sysenter_flags_fixed+0xd/0x17

Freed by task 6490:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8803>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f9132>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f9132>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f6634>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f6634>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f6634>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f6634>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff82f37134>] skb_free_head net/core/skbuff.c:571 [inline]
 [<ffffffff82f37134>] skb_release_data+0x304/0x3b0 net/core/skbuff.c:602
 [<ffffffff82f3722a>] skb_release_all+0x4a/0x60 net/core/skbuff.c:661
 [<ffffffff82f37833>] __kfree_skb net/core/skbuff.c:675 [inline]
 [<ffffffff82f37833>] consume_skb+0xf3/0x3d0 net/core/skbuff.c:748
 [<ffffffff830b1f52>] netlink_broadcast_filtered+0x2b2/0x9c0 net/netlink/af_netlink.c:1479
 [<ffffffff81e18138>] kobject_uevent_env+0x6d8/0xb80 lib/kobject_uevent.c:316
 [<ffffffff81e185ff>] kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374
 [<ffffffff81e15224>] kobject_cleanup lib/kobject.c:630 [inline]
 [<ffffffff81e15224>] kobject_release+0x144/0x1b0 lib/kobject.c:672
 [<ffffffff81e14e42>] kref_sub include/linux/kref.h:73 [inline]
 [<ffffffff81e14e42>] kref_put include/linux/kref.h:98 [inline]
 [<ffffffff81e14e42>] kobject_put+0x72/0xd0 lib/kobject.c:689
 [<ffffffff82fd836d>] netdev_queue_update_kobjects+0x18d/0x290 net/core/net-sysfs.c:1327
 [<ffffffff82fd851a>] remove_queue_kobjects net/core/net-sysfs.c:1377 [inline]
 [<ffffffff82fd851a>] netdev_unregister_kobject+0xaa/0x110 net/core/net-sysfs.c:1511
 [<ffffffff82f71ae8>] rollback_registered_many+0x3f8/0x760 net/core/dev.c:6367
 [<ffffffff82f74c2b>] unregister_netdevice_many.part.98+0x1b/0x110 net/core/dev.c:7354
 [<ffffffff82f74d56>] unregister_netdevice_many+0x36/0x50 net/core/dev.c:7353
 [<ffffffff83346aaf>] ip_tunnel_delete_net+0x2af/0x390 net/ipv4/ip_tunnel.c:1033
 [<ffffffff83365e19>] ipip_exit_net+0x129/0x1f0 net/ipv4/ipip.c:542
 [<ffffffff82f5d1f0>] ops_exit_list.isra.6+0xb0/0x160 net/core/net_namespace.c:134
 [<ffffffff82f601b1>] cleanup_net+0x321/0x600 net/core/net_namespace.c:452
 [<ffffffff81181f4f>] process_one_work+0x7df/0x1600 kernel/workqueue.c:2064
 [<ffffffff81182e49>] worker_thread+0xd9/0xfc0 kernel/workqueue.c:2196
 [<ffffffff81190958>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff838c2b95>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510

The buggy address belongs to the object at ffff8801d1bf4280
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8801d1bf4280, ffff8801d1bf4480)
The buggy address belongs to the page:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:3123 __lock_acquire+0x23b8/0x5270 kernel/locking/lockdep.c:3123()
DEBUG_LOCKS_WARN_ON(depth >= MAX_LOCK_DEPTH)