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BUG: KASAN: slab-out-of-bounds in nla_strlcpy+0x13d/0x150 lib/nlattr.c:314
Read of size 1 at addr ffff8801c8319fad by task syz-executor0/19257

CPU: 1 PID: 19257 Comm: syz-executor0 Not tainted 4.17.0-rc6+ #70
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
 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_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
 __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:00007ff735f0ac68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff735f0b6d4 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 4564:
 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
 dup_fd+0x114/0xf40 fs/file.c:280
 copy_files kernel/fork.c:1338 [inline]
 copy_process.part.38+0x1e28/0x6e70 kernel/fork.c:1782
 copy_process kernel/fork.c:1607 [inline]
 _do_fork+0x291/0x12a0 kernel/fork.c:2088
 __do_sys_clone kernel/fork.c:2195 [inline]
 __se_sys_clone kernel/fork.c:2189 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2189
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6096:
 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
 put_files_struct+0x315/0x390 fs/file.c:421
 exit_files+0x83/0xb0 fs/file.c:445
 do_exit+0xf50/0x2730 kernel/exit.c:860
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 __do_sys_exit_group kernel/exit.c:979 [inline]
 __se_sys_exit_group kernel/exit.c:977 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801c8319c00
 which belongs to the cache files_cache of size 832
The buggy address is located 109 bytes to the right of
 832-byte region [ffff8801c8319c00, ffff8801c8319f40)
The buggy address belongs to the page:
page:ffffea000720c640 count:1 mapcount:0 mapping:ffff8801c83190c0 index:0xffff8801c8319c00
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c83190c0 ffff8801c8319c00 0000000100000001
raw: ffffea0006a299e0 ffffea0006f6b3a0 ffff8801da97acc0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c8319e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801c8319f00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8801c8319f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                  ^
 ffff8801c831a000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c831a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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