==================================================================
BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1188 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x2537/0x3220 net/key/af_key.c:1506
Read of size 6784 at addr ffff8800b9575418 by task syz-executor0/6537

CPU: 0 PID: 6537 Comm: syz-executor0 Not tainted 4.4.135-gb68f27c #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 863ef57e58b99e3a ffff8800957176c0 ffffffff81e0ed0d
 ffffea0002e55d00 ffff8800b9575418 0000000000000000 ffff8800b9575600
 ffff8800b9575400 ffff8800957176f8 ffffffff81515946 ffff8800b9575418
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
 [<ffffffff83588787>] pfkey_msg2xfrm_state net/key/af_key.c:1188 [inline]
 [<ffffffff83588787>] pfkey_add+0x2537/0x3220 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 6537:
 [<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 4502:
 [<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
 [<ffffffff82f37255>] __kfree_skb+0x15/0x20 net/core/skbuff.c:675
 [<ffffffff82f37357>] kfree_skb+0xf7/0x3e0 net/core/skbuff.c:696
 [<ffffffff834159d5>] unix_release_sock+0x4b5/0xa00 net/unix/af_unix.c:559
 [<ffffffff83415f64>] unix_release+0x44/0x90 net/unix/af_unix.c:835
 [<ffffffff82f1a0b6>] sock_release+0x96/0x1c0 net/socket.c:586
 [<ffffffff82f1a1f6>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff81522d35>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81523275>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bd7f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff8100362d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100362d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252
 [<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
 [<ffffffff838c40aa>] sysenter_flags_fixed+0xd/0x17

The buggy address belongs to the object at ffff8800b9575400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8800b9575400, ffff8800b9575600)
The buggy address belongs to the page:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3908 Comm: syz-executor0 Not tainted 4.4.135-gb68f27c #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d8766000 task.stack: ffff8800ab240000
RIP: 0010:[<ffffffff81e718f6>]  [<ffffffff81e718f6>] __debug_check_no_obj_freed lib/debugobjects.c:689 [inline]
RIP: 0010:[<ffffffff81e718f6>]  [<ffffffff81e718f6>] debug_check_no_obj_freed+0x1a6/0x940 lib/debugobjects.c:726
RSP: 0018:ffff8800ab247840  EFLAGS: 00010007
RAX: 0000000000000296 RBX: 4f5f4755425f4d56 RCX: ffffffff81e71d3e
RDX: 09ebe8eaa84be9aa RSI: 0000000000000003 RDI: ffffffff83aa9ef8
RBP: ffff8800ab247928 R08: ffff8800ab2478c0 R09: dead000000000200
R10: 0000000000000001 R11: ffff8801d8766000 R12: 4f5f4755425f4d56
R13: dffffc0000000000 R14: ffffffff85a49768 R15: 0000292965676170
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000008148cf07 CR3: 000000000440c000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d8766900 ffff8800ab2478c0 ffffffff85a49760 ffff8801c5f5d000
 ffff8801c5f5d000 ffffffff00000003 0000000000000296 00000000000b6f80
 1ffff10015648f14 ffff8801c5f5c000 fffffbfff0b492ec ffff8801c5f5c000
Call Trace:
 [<ffffffff8142ca6e>] free_pages_prepare+0x51e/0xad0 mm/page_alloc.c:1049
 [<ffffffff81430e2f>] free_hot_cold_page+0x3f/0x3a0 mm/page_alloc.c:2112
 [<ffffffff81431228>] free_hot_cold_page_list+0x98/0x3c0 mm/page_alloc.c:2160
 [<ffffffff814469f7>] release_pages+0x1f7/0x4f0 mm/swap.c:970
 [<ffffffff814cc836>] free_pages_and_swap_cache+0x106/0x140 mm/swap_state.c:266
 [<ffffffff81490974>] tlb_flush_mmu_free+0xb4/0x150 mm/memory.c:255
 [<ffffffff81493609>] tlb_flush_mmu mm/memory.c:264 [inline]
 [<ffffffff81493609>] tlb_finish_mmu+0x29/0xd0 mm/memory.c:275
 [<ffffffff814b0239>] exit_mmap+0x1e9/0x3a0 mm/mmap.c:2929
 [<ffffffff81125508>] __mmput kernel/fork.c:715 [inline]
 [<ffffffff81125508>] mmput+0xf8/0x2d0 kernel/fork.c:735
 [<ffffffff81135178>] exit_mm kernel/exit.c:444 [inline]
 [<ffffffff81135178>] do_exit+0x8d8/0x26b0 kernel/exit.c:746
 [<ffffffff8113b1d1>] do_group_exit+0x111/0x330 kernel/exit.c:889
 [<ffffffff8113b40d>] SYSC_exit_group kernel/exit.c:900 [inline]
 [<ffffffff8113b40d>] SyS_exit_group+0x1d/0x20 kernel/exit.c:898
 [<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
Code: 48 c7 c6 e0 27 99 85 4c 8b 24 3e 4d 85 e4 0f 84 f8 03 00 00 49 b9 00 02 00 00 00 00 ad de 31 f6 4c 8d 45 98 4c 89 e2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 e5 03 00 00 49 8d 7c 24 18 83 c6 01 49 8b 
RIP  [<ffffffff81e718f6>] __debug_check_no_obj_freed lib/debugobjects.c:689 [inline]
RIP  [<ffffffff81e718f6>] debug_check_no_obj_freed+0x1a6/0x940 lib/debugobjects.c:726
 RSP <ffff8800ab247840>
---[ end trace 88e8f3ecf227eece ]---