linux-kernel - [PATCH 1/2] fs/exofs: fix potential memory leak in mount option parsing

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Date:   Wed, 13 Jun 2018 12:05:13 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     ooo@...ctrozaur.com
Cc:     linux-kernel@...r.kernel.org, Chengguang Xu <cgxu519@....com>
Subject: [PATCH 1/2] 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@....com>
---
 fs/exofs/super.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 719a315..f3e17a9 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");
@@ -867,8 +868,10 @@ 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;
-- 
1.8.3.1