Btrfs: fix memory leak in btrfs_parse_early_options()

Don't leak subvol_name string in case multiple subvol= options are
given.  "The lastest option is effective" behavior (consistent with
subvolid= and subvolrootid= options) is preserved.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
(cherry picked from commit a90e8b6fb80db43b029e1e76205452afa8bdc77a)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 17acb686d1cffe496454b6d883c8b68152c3ae17..519e674ec488f4b685bdff4570a56be372bb782b 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -448,6 +448,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
                token = match_token(p, tokens, args);
                switch (token) {
                case Opt_subvol:
+                       kfree(*subvol_name);
                        *subvol_name = match_strdup(&args[0]);
                        break;
                case Opt_subvolid: