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BUG: KASAN: stack-out-of-bounds in strlen lib/string.c:481 [inline]
BUG: KASAN: stack-out-of-bounds in strlcpy+0x101/0x120 lib/string.c:141
Read of size 1 at addr ffff8800a1837cdc by task syz-executor2/21558

CPU: 0 PID: 21558 Comm: syz-executor2 Not tainted 4.4.152-ge5c5f1f #89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 f12204ea1c7da710 ffff8800a1837b50 ffffffff81e15fed
 ffffea0002860dc0 ffff8800a1837cdc 0000000000000000 ffff8800a1837cdc
 ffff8800a1837c50 ffff8800a1837b88 ffffffff8151b489 ffff8800a1837cdc
Call Trace:
 [<ffffffff81e15fed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e15fed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b489>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b7a8>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b7a8>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe6d4>] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426
 [<ffffffff81e32ff1>] strlen lib/string.c:481 [inline]
 [<ffffffff81e32ff1>] strlcpy+0x101/0x120 lib/string.c:141
 [<ffffffff82e625ff>] snd_seq_ioctl_create_queue+0x1bf/0x2c0 sound/core/seq/seq_clientmgr.c:1561
 [<ffffffff82e64677>] snd_seq_do_ioctl+0x177/0x1a0 sound/core/seq/seq_clientmgr.c:2223
 [<ffffffff82e64861>] snd_seq_ioctl+0x71/0xa0 sound/core/seq/seq_clientmgr.c:2240
 [<ffffffff8155f6ff>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff8155f6ff>] file_ioctl fs/ioctl.c:470 [inline]
 [<ffffffff8155f6ff>] do_vfs_ioctl+0x63f/0xf40 fs/ioctl.c:605
 [<ffffffff8156008f>] SYSC_ioctl fs/ioctl.c:622 [inline]
 [<ffffffff8156008f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613
 [<ffffffff838cc565>] entry_SYSCALL_64_fastpath+0x22/0x9e

The buggy address belongs to the page:
page:ffffea0002860dc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8800a1837b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8800a1837c00: 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00
>ffff8800a1837c80: 00 00 00 00 00 00 00 00 00 00 00 04 f2 f2 00 00
                                                    ^
 ffff8800a1837d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8800a1837d80: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
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