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BUG: KASAN: use-after-free in nla_strlcpy+0x13d/0x150 lib/nlattr.c:314
Read of size 1 at addr ffff8801aee5272d by task syz-executor3/4952

CPU: 1 PID: 4952 Comm: syz-executor3 Not tainted 4.17.0-rc6+ #63
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 nla_strlcpy+0x13d/0x150 lib/nlattr.c:314
 nfnl_acct_new+0x574/0xc50 net/netfilter/nfnetlink_acct.c:118
netlink: 'syz-executor2': attribute type 41 has an invalid length.
 nfnetlink_rcv_msg+0xdb5/0xff0 net/netfilter/nfnetlink.c:212
 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448
 nfnetlink_rcv+0x1fe/0x1ba0 net/netfilter/nfnetlink.c:513
netlink: 'syz-executor2': attribute type 41 has an invalid length.
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x805/0x940 net/socket.c:2117
netlink: 'syz-executor2': attribute type 41 has an invalid length.
 __sys_sendmsg+0x115/0x270 net/socket.c:2155
 __do_sys_sendmsg net/socket.c:2164 [inline]
 __se_sys_sendmsg net/socket.c:2162 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f9b912c7c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9b912c86d4 RCX: 0000000000455a09
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000005a3 R14: 00000000006fc7e8 R15: 0000000000000000

Allocated by task 6638:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554
 kmem_cache_zalloc include/linux/slab.h:691 [inline]
 get_empty_filp+0x125/0x520 fs/file_table.c:122
 alloc_file+0x24/0x3e0 fs/file_table.c:163
 anon_inode_getfile+0x29a/0x4c0 fs/anon_inodes.c:105
 do_epoll_create+0x392/0x5b0 fs/eventpoll.c:1965
 __do_sys_epoll_create1 fs/eventpoll.c:1984 [inline]
 __se_sys_epoll_create1 fs/eventpoll.c:1982 [inline]
 __x64_sys_epoll_create1+0x31/0x40 fs/eventpoll.c:1982
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
netlink: 'syz-executor2': attribute type 41 has an invalid length.
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 2387:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
 file_free_rcu+0x6f/0x90 fs/file_table.c:49
 __rcu_reclaim kernel/rcu/rcu.h:178 [inline]
 rcu_do_batch kernel/rcu/tree.c:2675 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
 rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285

The buggy address belongs to the object at ffff8801aee525c0
 which belongs to the cache filp of size 456
The buggy address is located 365 bytes inside of
 456-byte region [ffff8801aee525c0, ffff8801aee52788)
The buggy address belongs to the page:
page:ffffea0006bb9480 count:1 mapcount:0 mapping:ffff8801aee520c0 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801aee520c0 0000000000000000 0000000100000006
raw: ffffea0006bed820 ffffea0006c98360 ffff8801da988940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801aee52600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801aee52680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801aee52700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8801aee52780: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801aee52800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
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