==================================================================
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 2112 at addr ffff8801cf6d0f40 by task syz-executor5/29156

CPU: 0 PID: 29156 Comm: syz-executor5 Not tainted 4.4.133-g3f51ea2 #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 06b294953aed1ef6 ffff88009d6af6c0 ffffffff81e0e4cd
 ffffea00073db400 ffff8801cf6d0f40 0000000000000000 ffff8801cf6d1100
 ffff8801cf6d0f00 ffff88009d6af6f8 ffffffff815154cc ffff8801cf6d0f40
Call Trace:
 [<ffffffff81e0e4cd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e0e4cd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff815154cc>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff815157eb>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff815157eb>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814f826f>] check_memory_region_inline mm/kasan/kasan.c:325 [inline]
 [<ffffffff814f826f>] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:332
 [<ffffffff814f87b3>] memcpy+0x23/0x50 mm/kasan/kasan.c:367
 [<ffffffff83585edd>] pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline]
 [<ffffffff83585edd>] pfkey_add+0x145d/0x3220 net/key/af_key.c:1506
 [<ffffffff8358a571>] pfkey_process+0x671/0x740 net/key/af_key.c:2834
 [<ffffffff8358bda6>] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678
 [<ffffffff82f1d14c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1d14c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1ec15>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f20cb6>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300aa0a>] C_SYSC_sendmsg net/compat.c:722 [inline]
 [<ffffffff8300aa0a>] 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
 [<ffffffff838c28aa>] sysenter_flags_fixed+0xd/0x17

Allocated by task 29156:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8393>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8677>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8677>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f8e54>] kasan_krealloc+0x64/0x80 mm/kasan/kasan.c:654
 [<ffffffff814f204a>] ksize+0x8a/0xf0 mm/slub.c:3727
 [<ffffffff82f37043>] __alloc_skb+0x133/0x600 net/core/skbuff.c:237
 [<ffffffff8358bb5e>] alloc_skb include/linux/skbuff.h:815 [inline]
 [<ffffffff8358bb5e>] pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665
 [<ffffffff82f1d14c>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1d14c>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1ec15>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f20cb6>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300aa0a>] C_SYSC_sendmsg net/compat.c:722 [inline]
 [<ffffffff8300aa0a>] 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
 [<ffffffff838c28aa>] sysenter_flags_fixed+0xd/0x17

Freed by task 27298:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8393>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8cc2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8cc2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f61c4>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f61c4>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f61c4>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f61c4>] kfree+0xf4/0x310 mm/slub.c:3749
 [<ffffffff8359b970>] l2tp_session_free+0x170/0x200 net/l2tp/l2tp_core.c:1676
 [<ffffffff835a5397>] l2tp_session_dec_refcount_1 net/l2tp/l2tp_core.h:293 [inline]
 [<ffffffff835a5397>] pppol2tp_session_destruct+0xd7/0x110 net/l2tp/l2tp_ppp.c:477
 [<ffffffff82f2e23c>] sk_destruct+0x4c/0x4c0 net/core/sock.c:1447
 [<ffffffff82f2e6ff>] __sk_free+0x4f/0x220 net/core/sock.c:1480
 [<ffffffff82f2e900>] sk_free+0x30/0x40 net/core/sock.c:1491
 [<ffffffff835a616a>] sock_put include/net/sock.h:1639 [inline]
 [<ffffffff835a616a>] pppol2tp_release+0x26a/0x310 net/l2tp/l2tp_ppp.c:518
 [<ffffffff82f190a6>] sock_release+0x96/0x1c0 net/socket.c:586
 [<ffffffff82f191e6>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff815228b5>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81522df5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bc3f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff81135175>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81135175>] do_exit+0x9e5/0x26b0 kernel/exit.c:759
 [<ffffffff8113b0c1>] do_group_exit+0x111/0x330 kernel/exit.c:889
 [<ffffffff8115e49c>] get_signal+0x4ec/0x14b0 kernel/signal.c:2317
 [<ffffffff8100e02b>] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712
 [<ffffffff8100360a>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:248
 [<ffffffff81007090>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
 [<ffffffff81007090>] syscall_return_slowpath arch/x86/entry/common.c:348 [inline]
 [<ffffffff81007090>] do_syscall_32_irqs_on arch/x86/entry/common.c:398 [inline]
 [<ffffffff81007090>] do_fast_syscall_32+0x620/0x8b0 arch/x86/entry/common.c:459
 [<ffffffff838c28aa>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8801cf6d0f00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 64 bytes inside of
 512-byte region [ffff8801cf6d0f00, ffff8801cf6d1100)
The buggy address belongs to the page:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:973 lock_accessed kernel/locking/lockdep.c:973 [inline]()
WARNING: CPU: 1 PID: 0 at kernel/locking/lockdep.c:973 __bfs+0x2aa/0x5f0 kernel/locking/lockdep.c:1040()