linux-kernel - [PATCH v3] fs: affs: fix a memory leak in affs

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Date:   Wed,  2 Oct 2019 16:52:37 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     dsterba@...e.cz
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        David Sterba <dsterba@...e.com>,
        Jeff Layton <jlayton@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] fs: affs: fix a memory leak in affs_remount

In affs_remount if data is provided it is duplicated into new_opts.
The allocated memory for new_opts is only released if pare_options fail.
But the variable is not used anywhere. So the new_opts should be
removed.

Fixes: c8f33d0bec99 ("affs: kstrdup() memory handling")
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
Changes in v2:
	-- fix typo
Changes in v3:
	-- remove the call to kstrdup, as new_opts is not used anymore.
---
 fs/affs/super.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/fs/affs/super.c b/fs/affs/super.c
index cc463ae47c12..b6c6080d186c 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -565,10 +565,6 @@ affs_remount(struct super_block *sb, int *flags, char *data)
 	char			 volume[32];
 	char			*prefix = NULL;
 
-	new_opts = kstrdup(data, GFP_KERNEL);
-	if (data && !new_opts)
-		return -ENOMEM;
-
 	pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
 
 	sync_filesystem(sb);
@@ -579,7 +575,6 @@ affs_remount(struct super_block *sb, int *flags, char *data)
 			   &blocksize, &prefix, volume,
 			   &mount_flags)) {
 		kfree(prefix);
-		kfree(new_opts);
 		return -EINVAL;
 	}
 
-- 
2.17.1