linux-kernel - [081/111] Btrfs: kfree correct pointer during mount option parsing

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Message-Id: <20100811235502.992426280@clark.site>
Date:	Wed, 11 Aug 2010 16:55:02 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Chris Mason <chris.mason@...cle.com>,
	Jeff Mahoney <jeffm@...e.com>
Subject: [081/111] Btrfs: kfree correct pointer during mount option parsing

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Josef Bacik <josef@...hat.com>

commit da495ecc0fb096b383754952a1c152147bc95b52 upstream.

We kstrdup the options string, but then strsep screws with the pointer,
so when we kfree() it, we're not giving it the right pointer.

Tested-by: Andy Lutomirski <luto@....edu>

Signed-off-by: Chris Mason <chris.mason@...cle.com>
Acked-by: Jeff Mahoney <jeffm@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/btrfs/super.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -126,7 +126,7 @@ int btrfs_parse_options(struct btrfs_roo
 {
 	struct btrfs_fs_info *info = root->fs_info;
 	substring_t args[MAX_OPT_ARGS];
-	char *p, *num;
+	char *p, *num, *orig;
 	int intarg;
 	int ret = 0;
 
@@ -141,6 +141,7 @@ int btrfs_parse_options(struct btrfs_roo
 	if (!options)
 		return -ENOMEM;
 
+	orig = options;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
@@ -273,7 +274,7 @@ int btrfs_parse_options(struct btrfs_roo
 		}
 	}
 out:
-	kfree(options);
+	kfree(orig);
 	return ret;
 }
 


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