linux-kernel - [031/244] carl9170: Fix mismatch in carl9170_op_set

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Date:	Wed, 28 Sep 2011 14:59:55 -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,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Christian Lamparter <chunkeey@...glemail.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [031/244] carl9170: Fix mismatch in carl9170_op_set_key mutex lock-unlock

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

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

From: Alexey Khoroshilov <khoroshilov@...ras.ru>

commit 66cb54bd24086b2d871a03035de9b0e79b2b725e upstream.

If is_main_vif(ar, vif) reports that we have to fall back
to software encryption, we goto err_softw; before locking ar->mutex.
As a result, we have unprotected call to carl9170_set_operating_mode
and unmatched mutex_unlock.

The patch fix the issue by adding mutex_lock before goto.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Acked-By: Christian Lamparter <chunkeey@...glemail.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/ath/carl9170/main.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/carl9170/main.c
+++ b/drivers/net/wireless/ath/carl9170/main.c
@@ -1066,8 +1066,10 @@ static int carl9170_op_set_key(struct ie
 	 * the high througput speed in 802.11n networks.
 	 */

-	if (!is_main_vif(ar, vif))
+	if (!is_main_vif(ar, vif)) {
+		mutex_lock(&ar->mutex);
 		goto err_softw;
+	}

 	/*
 	 * While the hardware supports *catch-all* key, for offloading

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