btrfs: prop: fix vanished compression property after failed set

commit 272e5326c7837697882ce3162029ba893059b616 upstream.

The compression property resets to NULL, instead of the old value if we
fail to set the new compression parameter.

  $ btrfs prop get /btrfs compression
    compression=lzo
  $ btrfs prop set /btrfs compression zli
    ERROR: failed to set compression for /btrfs: Invalid argument
  $ btrfs prop get /btrfs compression

This is because the compression property ->validate() is successful for
'zli' as the strncmp() used the length passed from the userspace.

Fix it by using the expected string length in strncmp().

Fixes: 63541927c8d1 ("Btrfs: add support for inode properties")
Fixes: 5c1aab1dd544 ("btrfs: Add zstd support")
CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index 3eee2f7e1dd2cbe985ee5f5eeff7c755f4538b58..266f9069307b13534229d5958512bdaa0c59b591 100644 (file)
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -386,11 +386,11 @@ int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans,
 
 static int prop_compression_validate(const char *value, size_t len)
 {
-       if (!strncmp("lzo", value, len))
+       if (!strncmp("lzo", value, 3))
                return 0;
-       else if (!strncmp("zlib", value, len))
+       else if (!strncmp("zlib", value, 4))
                return 0;
-       else if (!strncmp("zstd", value, len))
+       else if (!strncmp("zstd", value, 4))
                return 0;
 
        return -EINVAL;