netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'.
==================================================================
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+0x1481/0x3230 net/key/af_key.c:1506
Read of size 5504 at addr ffff8801da2c8040 by task syz-executor7/12519

CPU: 0 PID: 12519 Comm: syz-executor7 Not tainted 4.9.105-gd7e64f8 #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801799276e0 ffffffff81eb41a9 ffffea000768b200 ffff8801da2c8040
 0000000000000000 ffff8801da2c8200 ffff8801da2c8000 ffff880179927718
 ffffffff81567e49 ffff8801da2c8040 0000000000001580 0000000000000000
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81567e49>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff81568253>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff81568253>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153ad0f>] check_memory_region_inline mm/kasan/kasan.c:318 [inline]
 [<ffffffff8153ad0f>] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:325
 [<ffffffff8153b353>] memcpy+0x23/0x50 mm/kasan/kasan.c:360
 [<ffffffff836af681>] pfkey_msg2xfrm_state net/key/af_key.c:1227 [inline]
 [<ffffffff836af681>] pfkey_add+0x1481/0x3230 net/key/af_key.c:1506
 [<ffffffff836a6e91>] pfkey_process+0x671/0x740 net/key/af_key.c:2834
 [<ffffffff836a86b6>] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678
 [<ffffffff83016fcc>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff83016fcc>] sock_sendmsg+0xcc/0x110 net/socket.c:645
 [<ffffffff83018a6c>] ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969
 [<ffffffff8301aad9>] __sys_sendmsg+0xd9/0x190 net/socket.c:2003
 [<ffffffff8301abbd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff8301abbd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Allocated by task 12519:
 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+0xc7/0xe0 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+0xdc/0x2b0 mm/slub.c:4232
 __kmalloc_reserve.isra.37+0x33/0xc0 net/core/skbuff.c:138
 __alloc_skb+0x11a/0x600 net/core/skbuff.c:231
 alloc_skb include/linux/skbuff.h:919 [inline]
 pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665
 sock_sendmsg_nosec net/socket.c:635 [inline]
 sock_sendmsg+0xcc/0x110 net/socket.c:645
 ___sys_sendmsg+0x6fc/0x840 net/socket.c:1969
 __sys_sendmsg+0xd9/0x190 net/socket.c:2003
 SYSC_sendmsg net/socket.c:2014 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Freed by task 11222:
 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+0xfb/0x310 mm/slub.c:3878
 load_elf_binary+0x1f12/0x4be0 fs/binfmt_elf.c:1080
 search_binary_handler+0x14f/0x6f0 fs/exec.c:1622
 exec_binprm fs/exec.c:1664 [inline]
 do_execveat_common.isra.40+0x11c5/0x1f30 fs/exec.c:1786
 do_execve+0x3a/0x50 fs/exec.c:1830
 call_usermodehelper_exec_async+0x296/0x4d0 kernel/kmod.c:252
 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

The buggy address belongs to the object at ffff8801da2c8000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 64 bytes inside of
 512-byte region [ffff8801da2c8000, ffff8801da2c8200)
The buggy address belongs to the page:
page:ffffea000768b200 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:
 ffff8801da2c8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801da2c8180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801da2c8200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801da2c8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801da2c8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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