linux-kernel - [PATCH 4.4 065/342] bcache: fix a leak in bch_cached_dev

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Message-Id: <20160301234530.099781748@linuxfoundation.org>
Date:	Tue, 01 Mar 2016 23:54:05 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Al Viro <viro@...iv.linux.org.uk>,
	Joshua Schmid <jschmid@...e.com>,
	Eric Wheeler <bcache@...ux.ewheeler.net>,
	Kent Overstreet <kmo@...erainc.com>, Jens Axboe <axboe@...com>
Subject: [PATCH 4.4 065/342] bcache: fix a leak in bch_cached_dev_run()

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Al Viro <viro@...IV.linux.org.uk>

commit 4d4d8573a8451acc9f01cbea24b7e55f04a252fe upstream.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Tested-by: Joshua Schmid <jschmid@...e.com>
Tested-by: Eric Wheeler <bcache@...ux.ewheeler.net>
Cc: Kent Overstreet <kmo@...erainc.com>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/bcache/super.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -849,8 +849,11 @@ void bch_cached_dev_run(struct cached_de
 	buf[SB_LABEL_SIZE] = '\0';
 	env[2] = kasprintf(GFP_KERNEL, "CACHED_LABEL=%s", buf);
 
-	if (atomic_xchg(&dc->running, 1))
+	if (atomic_xchg(&dc->running, 1)) {
+		kfree(env[1]);
+		kfree(env[2]);
 		return;
+	}
 
 	if (!d->c &&
 	    BDEV_STATE(&dc->sb) != BDEV_STATE_NONE) {