fs/exofs: fix potential memory leak in mount option parsing

There are some cases can cause memory leak when parsing
option 'osdname'.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 41cf2fbee50d..7d61e3fa378c 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -101,6 +101,7 @@ static int parse_options(char *options, struct exofs_mountopt *opts)
                 token = match_token(p, tokens, args);
                 switch (token) {
                 case Opt_name:
+                        kfree(opts->dev_name);
                         opts->dev_name = match_strdup(&args[0]);
                         if (unlikely(!opts->dev_name)) {
                                 EXOFS_ERR("Error allocating dev_name");
@@ -866,8 +867,10 @@ static struct dentry *exofs_mount(struct file_system_type *type,
         int ret;
 
         ret = parse_options(data, &opts);
-        if (ret)
+        if (ret) {
+                kfree(opts.dev_name);
                 return ERR_PTR(ret);
+        }
 
         if (!opts.dev_name)
                 opts.dev_name = dev_name;