diff mbox series

[1/4,RESEND] btrfs: fix zstd compression parameter

Message ID 20190402100742.8355-2-anand.jain@oracle.com (mailing list archive)
State New, archived
Headers show
Series btrfs: fix property bugs | expand

Commit Message

Anand Jain April 2, 2019, 10:07 a.m. UTC 
We let to pass zstd compression parameter even if its not fully written.
For example:
  btrfs prop set /btrfs compression zst
  btrfs prop get /btrfs compression
     compression=zst

zlib and lzo are fine.

Fix it by using the expected number of char in strncmp().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
---
 fs/btrfs/props.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

David Sterba April 2, 2019, 10:09 p.m. UTC | #1 
On Tue, Apr 02, 2019 at 06:07:38PM +0800, Anand Jain wrote:
> We let to pass zstd compression parameter even if its not fully written.
> For example:
>   btrfs prop set /btrfs compression zst
>   btrfs prop get /btrfs compression
>      compression=zst
> 
> zlib and lzo are fine.
> 
> Fix it by using the expected number of char in strncmp().
> 
> Signed-off-by: Anand Jain <anand.jain@oracle.com>
> Reviewed-by: Nikolay Borisov <nborisov@suse.com>

Reviewed-by: David Sterba <dsterba@suse.com>
diff mbox series

Patch

diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index f1a8be67f639..3cc007e3c7f8 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -304,7 +304,7 @@  static int prop_compression_apply(struct inode *inode, const char *value,
 		btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
 	} else if (!strncmp("zlib", value, 4)) {
 		type = BTRFS_COMPRESS_ZLIB;
-	} else if (!strncmp("zstd", value, len)) {
+	} else if (!strncmp("zstd", value, 4)) {
 		type = BTRFS_COMPRESS_ZSTD;
 		btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
 	} else {