[patch] [media] xc2028: unlock on error in xc2028_set_config()

[Dan Carpenter]

We have to unlock before returning -ENOMEM.

Fixes: 8dfbcc4351a0 ('[media] xc2028: avoid use after free')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.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;