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| author | Anand Jain <anand.jain@oracle.com> | 2019-04-02 12:07:40 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-04-04 17:57:53 +0200 |
| commit | 272e5326c7837697882ce3162029ba893059b616 (patch) | |
| tree | be2f5760d1a6892503ef14f29b564531a0d75671 /fs/btrfs | |
| parent | btrfs: prop: fix zstd compression parameter validation (diff) | |
| download | linux-272e5326c7837697882ce3162029ba893059b616.tar.xz linux-272e5326c7837697882ce3162029ba893059b616.zip | |
btrfs: prop: fix vanished compression property after failed set
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>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/props.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c index fd19f3078566..61d22a56c0ba 100644 --- a/fs/btrfs/props.c +++ b/fs/btrfs/props.c @@ -366,11 +366,11 @@ 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; |