IPVS: Creating netns size=2536 id=1
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BUG: KASAN: use-after-free in take_option security/selinux/hooks.c:2634 [inline]
BUG: KASAN: use-after-free in selinux_sb_copy_data+0x25f/0x390 security/selinux/hooks.c:2689
Write of size 10 at addr ffff8801da1ee000 by task syz-executor0/3789

CPU: 0 PID: 3789 Comm: syz-executor0 Not tainted 4.9.92-g13b40d3 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b6c0f4b0 ffffffff81d95109 ffffea0007687b80 ffff8801da1ee000
 0000000000000001 ffff8801da1ee000 dffffc0000000000 ffff8801b6c0f4e8
 ffffffff8153d5d3 ffff8801da1ee000 000000000000000a 0000000000000001
Call Trace:
 [<ffffffff81d95109>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95109>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153d5d3>] print_address_description+0x73/0x280 mm/kasan/report.c:256
 [<ffffffff8153dad5>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8153dad5>] kasan_report+0x255/0x380 mm/kasan/report.c:412
 [<ffffffff8153c407>] check_memory_region_inline mm/kasan/kasan.c:318 [inline]
 [<ffffffff8153c407>] check_memory_region+0x137/0x190 mm/kasan/kasan.c:325
 [<ffffffff8153ca57>] memcpy+0x37/0x50 mm/kasan/kasan.c:361
 [<ffffffff81bebb2f>] take_option security/selinux/hooks.c:2634 [inline]
 [<ffffffff81bebb2f>] selinux_sb_copy_data+0x25f/0x390 security/selinux/hooks.c:2689
 [<ffffffff81bcd455>] security_sb_copy_data+0x75/0xb0 security/security.c:283
 [<ffffffff8196e1f6>] parse_security_options+0x36/0x90 fs/btrfs/super.c:1493
 [<ffffffff81980272>] btrfs_mount+0xa02/0x2c00 fs/btrfs/super.c:1572
 [<ffffffff8157ac2f>] mount_fs+0x27f/0x350 fs/super.c:1206
 [<ffffffff815d8c90>] vfs_kern_mount.part.21+0xd0/0x3e0 fs/namespace.c:991
 [<ffffffff815d8fe0>] vfs_kern_mount+0x40/0x60 fs/namespace.c:973
 [<ffffffff8197fb5e>] mount_subvol fs/btrfs/super.c:1395 [inline]
 [<ffffffff8197fb5e>] btrfs_mount+0x2ee/0x2c00 fs/btrfs/super.c:1566
 [<ffffffff8157ac2f>] mount_fs+0x27f/0x350 fs/super.c:1206
 [<ffffffff815d8c90>] vfs_kern_mount.part.21+0xd0/0x3e0 fs/namespace.c:991
 [<ffffffff815e0401>] vfs_kern_mount fs/namespace.c:2509 [inline]
 [<ffffffff815e0401>] do_new_mount fs/namespace.c:2512 [inline]
 [<ffffffff815e0401>] do_mount+0x3e1/0x28b0 fs/namespace.c:2834
 [<ffffffff81679c90>] C_SYSC_mount fs/compat.c:810 [inline]
 [<ffffffff81679c90>] compat_SyS_mount+0xd0/0x1070 fs/compat.c:775
 [<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b9c90>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

The buggy address belongs to the page:
page:ffffea0007687b80 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801da1edf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801da1edf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801da1ee000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff8801da1ee080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801da1ee100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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