stable inclusion
from stable-4.19.243
commit 8033f109be4a1d5b466284e8ab9119c04f2a334b
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5A6BA
CVE: NA

--------------------------------

If two processes mount same superblock, memory leak occurs:

CPU0               |  CPU1
do_new_mount       |  do_new_mount
  fs_set_subtype   |    fs_set_subtype
    kstrdup        |
                   |      kstrdup
    memrory leak   |

The following reproducer triggers the problem:

1. shell command: mount -t ntfs /dev/sda1 /mnt &
2. c program: mount("/dev/sda1", "/mnt", "fuseblk", 0, "...")

with kmemleak report being along the lines of

unreferenced object 0xffff888235f1a5c0 (size 8):
  comm "mount.ntfs", pid 2860, jiffies 4295757824 (age 43.423s)
  hex dump (first 8 bytes):
    00 a5 f1 35 82 88 ff ff                          ...5....
  backtrace:
    [<00000000656e30cc>] __kmalloc_track_caller+0x16e/0x430
    [<000000008e591727>] kstrdup+0x3e/0x90
    [<000000008430d12b>] do_mount.cold+0x7b/0xd9
    [<0000000078d639cd>] ksys_mount+0xb2/0x150
    [<000000006015988d>] __x64_sys_mount+0x29/0x40
    [<00000000e0a7c118>] do_syscall_64+0xc1/0x1d0
    [<00000000bcea7df5>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
    [<00000000803a4067>] 0xffffffffffffffff

Linus's tree already have refactoring patchset [1], one of them can fix this bug:
        c30da2e9 ("fuse: convert to use the new mount API")
After refactoring, init super_block->s_subtype in fuse_fill_super.

Since we did not merge the refactoring patchset in this branch, I create this patch.
This patch fix this by adding a write lock while calling fs_set_subtype.

[1] https://patchwork.kernel.org/project/linux-fsdevel/patch/20190903113640.7984-3-mszeredi@redhat.com/

Fixes: 79c0b2df ("add filesystem subtype support")
Cc: David Howells <dhowells@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NChenXiaoSong <chenxiaosong2@huawei.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>