audit: type=1400 audit(1543389802.736:5): avc:  denied  { associate } for  pid=2065 comm="syz-executor0" name="syz0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
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BUG: KASAN: user-memory-access in bitmap_zero include/linux/bitmap.h:197 [inline]
BUG: KASAN: user-memory-access in n_tty_set_termios+0xf6/0xd30 drivers/tty/n_tty.c:1786
Write of size 512 at addr 0000000000001060 by task syz-executor0/7501

CPU: 0 PID: 7501 Comm: syz-executor0 Not tainted 4.9.141+ #69
 ffff8801c7b7f708 ffffffff81b42e79 0000000000001060 0000000000000200
 0000000000000001 000000000000005d ffff8801c7b7f848 ffff8801c7b7f750
 ffffffff81500bed ffffffff81d2f7b6 0000000000000286 b2386a01248cb711
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81500bed>] kasan_report_error mm/kasan/report.c:353 [inline]
 [<ffffffff81500bed>] kasan_report.cold.6+0x6d/0x2fe mm/kasan/report.c:412
 [<ffffffff814f1dfd>] check_memory_region_inline mm/kasan/kasan.c:318 [inline]
 [<ffffffff814f1dfd>] check_memory_region+0x14d/0x1b0 mm/kasan/kasan.c:325
 [<ffffffff814f23b3>] memset+0x23/0x40 mm/kasan/kasan.c:343
 [<ffffffff81d2f7b6>] bitmap_zero include/linux/bitmap.h:197 [inline]
 [<ffffffff81d2f7b6>] n_tty_set_termios+0xf6/0xd30 drivers/tty/n_tty.c:1786
 [<ffffffff81d3a4d6>] tty_set_termios+0x626/0x8a0 drivers/tty/tty_ioctl.c:562
 [<ffffffff81d3b441>] set_termios+0x311/0x520 drivers/tty/tty_ioctl.c:635
 [<ffffffff81d3bf92>] tty_mode_ioctl+0x8c2/0x980 drivers/tty/tty_ioctl.c:970
 [<ffffffff81d3c0f4>] n_tty_ioctl_helper+0x44/0x370 drivers/tty/tty_ioctl.c:1161
 [<ffffffff81d36cb6>] n_tty_ioctl+0x46/0x2e0 drivers/tty/n_tty.c:2452
 [<ffffffff81d286b0>] tty_ioctl+0x440/0x2190 drivers/tty/tty_io.c:3014
 [<ffffffff81546dec>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff81546dec>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff81546dec>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff81547e6f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff81547e6f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
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