linux-kernel - [ 020/167] [PATCH] [media] drxk: Does not unlock mutex if sanity check failed in scu

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Message-Id: <20120509055032.360572129@decadent.org.uk>
Date:	Wed, 09 May 2012 06:50:49 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: [ 020/167] [PATCH] [media] drxk: Does not unlock mutex if sanity check failed
 in scu_command()

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

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

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

commit e4459e1682c107d7ee1bf102c1ba534230e9b50b upstream.

If sanity check fails in scu_command(), goto error leads to unlock of
an unheld mutex. The check should not fail in reality, but it nevertheless
worth fixing.

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/dvb/frontends/drxk_hard.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/dvb/frontends/drxk_hard.c b/drivers/media/dvb/frontends/drxk_hard.c
index 36d1175..a414b1f 100644
--- a/drivers/media/dvb/frontends/drxk_hard.c
+++ b/drivers/media/dvb/frontends/drxk_hard.c
@@ -1520,8 +1520,10 @@ static int scu_command(struct drxk_state *state,
 	dprintk(1, "\n");
 
 	if ((cmd == 0) || ((parameterLen > 0) && (parameter == NULL)) ||
-	    ((resultLen > 0) && (result == NULL)))
-		goto error;
+	    ((resultLen > 0) && (result == NULL))) {
+		printk(KERN_ERR "drxk: Error %d on %s\n", status, __func__);
+		return status;
+	}
 
 	mutex_lock(&state->mutex);
 
-- 
1.7.10



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