linux-kernel - [patch] [media] xc2028: unlock on error in xc2028_set

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Message-ID: <20160203153359.GA2884@mwanda>
Date:	Wed, 3 Feb 2016 18:34:00 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Mauro Carvalho Chehab <mchehab@....samsung.com>
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] [media] xc2028: unlock on error in xc2028_set_config()

We have to unlock before returning -ENOMEM.

Fixes: 8dfbcc4351a0 ('[media] xc2028: avoid use after free')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/media/tuners/tuner-xc2028.c b/drivers/media/tuners/tuner-xc2028.c
index 082ff56..317ef63 100644
--- a/drivers/media/tuners/tuner-xc2028.c
+++ b/drivers/media/tuners/tuner-xc2028.c
@@ -1407,8 +1407,10 @@ static int xc2028_set_config(struct dvb_frontend *fe, void *priv_cfg)
 	memcpy(&priv->ctrl, p, sizeof(priv->ctrl));
 	if (p->fname) {
 		priv->ctrl.fname = kstrdup(p->fname, GFP_KERNEL);
-		if (priv->ctrl.fname == NULL)
-			return -ENOMEM;
+		if (priv->ctrl.fname == NULL) {
+			rc = -ENOMEM;
+			goto unlock;
+		}
 	}
 
 	/*
@@ -1440,6 +1442,7 @@ static int xc2028_set_config(struct dvb_frontend *fe, void *priv_cfg)
 		} else
 			priv->state = XC2028_WAITING_FIRMWARE;
 	}
+unlock:
 	mutex_unlock(&priv->lock);
 
 	return rc;