netlink: 'syz-executor5': attribute type 27 has an invalid length.
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BUG: KASAN: slab-out-of-bounds in cap_convert_nscap+0x501/0x610 security/commoncap.c:498
Read of size 4 at addr ffff8801beb6a6c0 by task syz-executor4/27376

CPU: 0 PID: 27376 Comm: syz-executor4 Not tainted 4.15.0-rc4-mm1+ #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:355 [inline]
 kasan_report+0x23b/0x360 mm/kasan/report.c:413
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:433
 cap_convert_nscap+0x501/0x610 security/commoncap.c:498
 setxattr+0x365/0x400 fs/xattr.c:446
 SYSC_fsetxattr fs/xattr.c:508 [inline]
 SyS_fsetxattr+0x130/0x190 fs/xattr.c:497
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f2cd7fe9c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000be
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 00000000204ec000 RSI: 0000000020988fec RDI: 0000000000000013
RBP: 00000000000005ad R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000212 R12: 00000000006f68d8
R13: 00000000ffffffff R14: 00007f2cd7fea6d4 R15: 0000000000000000

Allocated by task 27376:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc_node mm/slab.c:3669 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3676
 kmalloc_node include/linux/slab.h:558 [inline]
 kvmalloc_node+0x99/0xd0 mm/util.c:397
 kvmalloc include/linux/mm.h:541 [inline]
 setxattr+0x152/0x400 fs/xattr.c:435
 SYSC_fsetxattr fs/xattr.c:508 [inline]
 SyS_fsetxattr+0x130/0x190 fs/xattr.c:497
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 24238:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xd6/0x260 mm/slab.c:3800
 netlbl_secattr_destroy include/net/netlabel.h:378 [inline]
 netlbl_secattr_free include/net/netlabel.h:409 [inline]
 selinux_netlbl_sk_security_free+0x218/0x2f0 security/selinux/netlabel.c:170
 selinux_sk_free_security+0x47/0x60 security/selinux/hooks.c:4908
 security_sk_free+0x48/0x80 security/security.c:1431
 sk_prot_free net/core/sock.c:1504 [inline]
 __sk_destruct+0x609/0x910 net/core/sock.c:1590
 sk_destruct+0x47/0x80 net/core/sock.c:1598
 __sk_free+0xf1/0x2b0 net/core/sock.c:1609
 sk_free+0x2a/0x40 net/core/sock.c:1620
 sock_put include/net/sock.h:1654 [inline]
 tcp_close+0x847/0xfc0 net/ipv4/tcp.c:2315
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
 sock_release+0x8d/0x1e0 net/socket.c:593
 sock_close+0x16/0x20 net/socket.c:1121
 __fput+0x327/0x7e0 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:869
 do_group_exit+0x149/0x400 kernel/exit.c:972
 get_signal+0x73f/0x16c0 kernel/signal.c:2337
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96

The buggy address belongs to the object at ffff8801beb6a6c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8801beb6a6c0, ffff8801beb6a6e0)
The buggy address belongs to the page:
page:ffffea0006fada80 count:1 mapcount:0 mapping:ffff8801beb6a000 index:0xffff8801beb6afc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801beb6a000 ffff8801beb6afc1 000000010000002e
raw: ffffea0007092660 ffffea00075e0ce0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801beb6a580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801beb6a600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801beb6a680: fb fb fb fb fc fc fc fc 01 fc fc fc fc fc fc fc
                                           ^
 ffff8801beb6a700: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801beb6a780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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