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From:   Chengguang Xu <cgxu519@gmx.com>
To:     ooo@electrozaur.com
Cc:     linux-kernel@vger.kernel.org, Chengguang Xu <cgxu519@gmx.com>
Subject: [PATCH] exofs: fix potential memory leak in mount option parsing
Date:   Sat, 14 Apr 2018 20:19:08 +0800
Message-Id: <1523708348-683-1-git-send-email-cgxu519@gmx.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

When specifying string type mount option several times
in a mount, current option parsing may cause memory leak.
Hence, call kfree for previous one in this case.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
---
 fs/exofs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 179cd5c..106b818 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");
-- 
1.8.3.1