affs: fix potential memory leak when parsing option 'prefix'

When specifying option 'prefix' multiple times, current option parsing
will cause memory leak.  Hence, call kfree for previous one in this
case.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/affs/super.c b/fs/affs/super.c
index e602619aed9de905ae6d1fcfb7a02a911dff0f5f..d1ad11a8a4a59c2d7de3e854cfeb8b28716be59d 100644 (file)
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -241,6 +241,7 @@ parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved,
                        affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
                        break;
                case Opt_prefix:
+                       kfree(*prefix);
                        *prefix = match_strdup(&args[0]);
                        if (!*prefix)
                                return 0;