==================================================================
BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1219 [inline]
BUG: KASAN: slab-out-of-bounds in pfkey_add+0x153e/0x3470 net/key/af_key.c:1498
Read of size 8192 at addr ffff8801c8913418 by task syzkaller441281/3327

CPU: 0 PID: 3327 Comm: syzkaller441281 Not tainted 4.9.74-g173c52e #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c85bf718 ffffffff81d91b09 ffffea0007224480 ffff8801c8913418
 0000000000000000 ffff8801c8913600 ffff8801c85bf958 ffff8801c85bf750
 ffffffff8153b503 ffff8801c8913418 0000000000002000 0000000000000000
Call Trace:
 [<ffffffff81d91b09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d91b09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153b503>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153ba25>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153ba25>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153a437>] check_memory_region_inline mm/kasan/kasan.c:318 [inline]
 [<ffffffff8153a437>] check_memory_region+0x137/0x190 mm/kasan/kasan.c:325
 [<ffffffff8153a973>] memcpy+0x23/0x50 mm/kasan/kasan.c:360
 [<ffffffff835716be>] pfkey_msg2xfrm_state net/key/af_key.c:1219 [inline]
 [<ffffffff835716be>] pfkey_add+0x153e/0x3470 net/key/af_key.c:1498
 [<ffffffff83569bde>] pfkey_process+0x61e/0x730 net/key/af_key.c:2826
 [<ffffffff8356b489>] pfkey_sendmsg+0x3a9/0x760 net/key/af_key.c:3670
 [<ffffffff82ed4baa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82ed4baa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82ed67a1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82ed87d6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82fdaeba>] C_SYSC_sendmsg net/compat.c:734 [inline]
 [<ffffffff82fdaeba>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:732
 [<ffffffff81006fc7>] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline]
 [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384
 [<ffffffff838b10e1>] entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124

Allocated by task 3327:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:609
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547
 slab_post_alloc_hook mm/slab.h:417 [inline]
 slab_alloc_node mm/slub.c:2715 [inline]
 slab_alloc mm/slub.c:2723 [inline]
 __kmalloc_track_caller+0xda/0x2b0 mm/slub.c:4232
 __kmalloc_reserve.isra.37+0x33/0xc0 net/core/skbuff.c:138
 __alloc_skb+0x119/0x600 net/core/skbuff.c:231
 alloc_skb include/linux/skbuff.h:919 [inline]
 pfkey_sendmsg+0x135/0x760 net/key/af_key.c:3657
 sock_sendmsg_nosec net/socket.c:635 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:645
 ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 C_SYSC_sendmsg net/compat.c:734 [inline]
 compat_SyS_sendmsg+0x2a/0x40 net/compat.c:732
 do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline]
 do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124

Freed by task 1873:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582
 slab_free_hook mm/slub.c:1355 [inline]
 slab_free_freelist_hook mm/slub.c:1377 [inline]
 slab_free mm/slub.c:2958 [inline]
 kfree+0x103/0x300 mm/slub.c:3878
 kernfs_fop_release+0xff/0x140 fs/kernfs/file.c:744
 __fput+0x28c/0x6e0 fs/file_table.c:208
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x115/0x190 kernel/task_work.c:116
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0xfc/0x120 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline]
 syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259
 entry_SYSCALL_64_fastpath+0xc4/0xc6

The buggy address belongs to the object at ffff8801c8913400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff8801c8913400, ffff8801c8913600)
The buggy address belongs to the page:
page:ffffea0007224480 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
flags: 0x8000000000004080(slab|head)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c8913500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c8913580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c8913600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801c8913680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c8913700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================