==================================================================
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 512 at addr ffff8800ad6a0c98 by task syz-executor7/28229

CPU: 1 PID: 28229 Comm: syz-executor7 Not tainted 4.4.136-gfb7e319 #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 b59123bbd4e6a5c9 ffff8801aeb676c0 ffffffff81e0edad
 ffffea0002b5a800 ffff8800ad6a0c98 0000000000000000 ffff8800ad6a0e80
 ffff8800ad6a0c80 ffff8801aeb676f8 ffffffff815159b6 ffff8800ad6a0c98
Call Trace:
 [<ffffffff81e0edad>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e0edad>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff815159b6>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff81515cd5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff81515cd5>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814f874f>] check_memory_region_inline mm/kasan/kasan.c:325 [inline]
 [<ffffffff814f874f>] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:332
 [<ffffffff814f8c93>] memcpy+0x23/0x50 mm/kasan/kasan.c:367
 [<ffffffff8358775d>] pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline]
 [<ffffffff8358775d>] pfkey_add+0x145d/0x3220 net/key/af_key.c:1506
 [<ffffffff8358bdf1>] pfkey_process+0x671/0x740 net/key/af_key.c:2834
 [<ffffffff8358d626>] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678
 [<ffffffff82f1e1fc>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1e1fc>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1fcc5>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f21d66>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300bb8a>] C_SYSC_sendmsg net/compat.c:722 [inline]
 [<ffffffff8300bb8a>] 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
 [<ffffffff838c416a>] sysenter_flags_fixed+0xd/0x17

Allocated by task 28229:
 [<ffffffff810341d6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814f8873>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814f8b57>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814f8b57>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f9334>] kasan_krealloc+0x64/0x80 mm/kasan/kasan.c:654
 [<ffffffff814f252a>] ksize+0x8a/0xf0 mm/slub.c:3727
 [<ffffffff82f380f3>] __alloc_skb+0x133/0x600 net/core/skbuff.c:237
 [<ffffffff8358d3de>] alloc_skb include/linux/skbuff.h:815 [inline]
 [<ffffffff8358d3de>] pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665
 [<ffffffff82f1e1fc>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1e1fc>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1fcc5>] ___sys_sendmsg+0x745/0x880 net/socket.c:1962
 [<ffffffff82f21d66>] __sys_sendmsg+0xd6/0x190 net/socket.c:1996
 [<ffffffff8300bb8a>] C_SYSC_sendmsg net/compat.c:722 [inline]
 [<ffffffff8300bb8a>] 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
 [<ffffffff838c416a>] sysenter_flags_fixed+0xd/0x17

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8800ad6a0c80
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8800ad6a0c80, ffff8800ad6a0e80)
The buggy address belongs to the page:
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle kernel paging request at ffff8800ad6a0c80
IP: [<ffff8800ad6a0c80>] 0xffff8800ad6a0c80
PGD 632d067 PUD 21ffff067 PMD 80000000ad6001e3 
Oops: 0011 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.136-gfb7e319 #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84417840 task.stack: ffffffff84400000
RIP: 0010:[<ffff8800ad6a0c80>]  [<ffff8800ad6a0c80>] 0xffff8800ad6a0c80
RSP: 0018:ffff8801db207db0  EFLAGS: 00010006
RAX: ffffffff84417840 RBX: ffff8801ae02fd28 RCX: 0000000000000000
RDX: 0000000000010000 RSI: ffffffff8129dd45 RDI: ffff8801ae02fd28
RBP: ffff8801db207ee0 R08: ffffffff8535b790 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff84417840 R12: ffff8800ad6a0c80
R13: ffff8801db219640 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8800ad6a0c80 CR3: 00000000a369d000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8129dd4d 0000000000000046 ffff8801db207e78 ffffffff84417840
 1ffff1003b640fc3 ffff8801db2196a0 ffffed003b640fcf 0000000000000001
 ffff8801db219700 0303880200000001 ffff8801db219678 ffff8801db219718
Call Trace:
 <IRQ> 
 [<ffffffff8129f4c1>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1359
 [<ffffffff810ad614>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:901
 [<ffffffff838c544c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:925
 [<ffffffff838c4390>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff81025da5>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline]
 [<ffffffff81025da5>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:290
 [<ffffffff810272f0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:281
 [<ffffffff8121bc07>] default_idle_call+0x57/0x70 kernel/sched/idle.c:93
 [<ffffffff8121c3af>] cpuidle_idle_call kernel/sched/idle.c:157 [inline]
 [<ffffffff8121c3af>] cpu_idle_loop kernel/sched/idle.c:253 [inline]
 [<ffffffff8121c3af>] cpu_startup_entry+0x6af/0x780 kernel/sched/idle.c:301
 [<ffffffff838af961>] rest_init+0x188/0x18e init/main.c:410
 [<ffffffff84a4b8a1>] start_kernel+0x6b3/0x6e7 init/main.c:682
 [<ffffffff84a4a30f>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff84a4a450>] x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:185
Code: 60 00 00 58 0c 6a ad 00 88 ff ff 58 0c 6a ad 00 88 ff ff 68 0c 6a ad 00 88 ff ff 68 0c 6a ad 00 88 ff ff 00 01 00 00 00 00 ad de <02> 03 00 03 0c 00 00 00 00 00 00 00 c6 00 00 00 02 00 09 00 00 
RIP  [<ffff8800ad6a0c80>] 0xffff8800ad6a0c80
 RSP <ffff8801db207db0>
CR2: ffff8800ad6a0c80
---[ end trace c3ab85ba183c9711 ]---