==================================================================
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 2048 at addr ffff8801d233e298 by task syz-executor2/23165

CPU: 1 PID: 23165 Comm: syz-executor2 Not tainted 4.4.132-g4b08356 #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 c1b46a19e2181efe ffff88009e7676c0 ffffffff81e0dfed
 ffffea000748cf80 ffff8801d233e298 0000000000000000 ffff8801d233e480
 ffff8801d233e280 ffff88009e7676f8 ffffffff8151527c ffff8801d233e298
Call Trace:
 [<ffffffff81e0dfed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e0dfed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151527c>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151559b>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151559b>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814f801f>] check_memory_region_inline mm/kasan/kasan.c:325 [inline]
 [<ffffffff814f801f>] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:332
 [<ffffffff814f8563>] memcpy+0x23/0x50 mm/kasan/kasan.c:367
 [<ffffffff8358522d>] pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline]
 [<ffffffff8358522d>] pfkey_add+0x145d/0x3220 net/key/af_key.c:1506
 [<ffffffff835898c1>] pfkey_process+0x671/0x740 net/key/af_key.c:2834
 [<ffffffff8358b0f6>] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678
 [<ffffffff82f1ce0c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1ce0c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1e8d5>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f20976>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300a5aa>] C_SYSC_sendmsg net/compat.c:720 [inline]
 [<ffffffff8300a5aa>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718
 [<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
 [<ffffffff838c1bea>] sysenter_flags_fixed+0xd/0x17

Allocated by task 23165:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8143>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8427>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8427>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f8c04>] kasan_krealloc+0x64/0x80 mm/kasan/kasan.c:654
 [<ffffffff814f1dfa>] ksize+0x8a/0xf0 mm/slub.c:3727
 [<ffffffff82f36d03>] __alloc_skb+0x133/0x600 net/core/skbuff.c:237
 [<ffffffff8358aeae>] alloc_skb include/linux/skbuff.h:815 [inline]
 [<ffffffff8358aeae>] pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665
 [<ffffffff82f1ce0c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1ce0c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1e8d5>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f20976>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300a5aa>] C_SYSC_sendmsg net/compat.c:720 [inline]
 [<ffffffff8300a5aa>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718
 [<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
 [<ffffffff838c1bea>] sysenter_flags_fixed+0xd/0x17

Freed by task 20752:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8143>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8a72>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8a72>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f5f74>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f5f74>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f5f74>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f5f74>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff82f35de4>] skb_free_head net/core/skbuff.c:571 [inline]
 [<ffffffff82f35de4>] skb_release_data+0x304/0x3b0 net/core/skbuff.c:602
 [<ffffffff82f35eda>] skb_release_all+0x4a/0x60 net/core/skbuff.c:661
 [<ffffffff82f35f05>] __kfree_skb+0x15/0x20 net/core/skbuff.c:675
 [<ffffffff82f36007>] kfree_skb+0xf7/0x3e0 net/core/skbuff.c:696
 [<ffffffff82fa1cb2>] __neigh_event_send+0x652/0xc50 net/core/neighbour.c:1016
 [<ffffffff82fa75cb>] neigh_event_send include/net/neighbour.h:431 [inline]
 [<ffffffff82fa75cb>] neigh_resolve_output+0x4eb/0x790 net/core/neighbour.c:1310
 [<ffffffff83427979>] dst_neigh_output include/net/dst.h:461 [inline]
 [<ffffffff83427979>] ip6_finish_output2+0x929/0x1ca0 net/ipv6/ip6_output.c:113
 [<ffffffff83430fb8>] ip6_finish_output+0x3b8/0x760 net/ipv6/ip6_output.c:131
 [<ffffffff83431518>] NF_HOOK_COND include/linux/netfilter.h:240 [inline]
 [<ffffffff83431518>] ip6_output+0x1b8/0x520 net/ipv6/ip6_output.c:145
 [<ffffffff8355a6bb>] dst_output include/net/dst.h:498 [inline]
 [<ffffffff8355a6bb>] ip6_local_out+0x9b/0x180 net/ipv6/output_core.c:169
 [<ffffffff83433551>] ip6_send_skb+0xa1/0x340 net/ipv6/ip6_output.c:1724
 [<ffffffff8348f331>] udp_v6_send_skb+0x4f1/0xe70 net/ipv6/udp.c:1066
 [<ffffffff83494d9e>] udpv6_sendmsg+0x1f2e/0x24c0 net/ipv6/udp.c:1330
 [<ffffffff832fecf3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff82f1ce0c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1ce0c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1e5d1>] ___sys_sendmsg+0x441/0x880 net/socket.c:1962
 [<ffffffff82f20c54>] __sys_sendmmsg+0x1d4/0x2e0 net/socket.c:2040
 [<ffffffff8300a5f2>] C_SYSC_sendmmsg net/compat.c:726 [inline]
 [<ffffffff8300a5f2>] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:723
 [<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
 [<ffffffff838c1bea>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8801d233e280
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8801d233e280, ffff8801d233e480)
The buggy address belongs to the page:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 23189 at kernel/locking/lockdep.c:973 lock_accessed kernel/locking/lockdep.c:973 [inline]()
WARNING: CPU: 0 PID: 23189 at kernel/locking/lockdep.c:973 __bfs+0x2aa/0x5f0 kernel/locking/lockdep.c:1040()