V4L/DVB (6622): tda827x: prevent possible NULL pointer dereference in tda827xa_lna_gain

If tda827x_config hasn't been defined, exit the function.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/tda827x.c b/drivers/media/dvb/frontends/tda827x.c
index 50adfb5395ec..229b11987a58 100644
--- a/drivers/media/dvb/frontends/tda827x.c
+++ b/drivers/media/dvb/frontends/tda827x.c
@@ -556,6 +556,11 @@ static void tda827xa_lna_gain(struct dvb_frontend *fe, int high,
         struct i2c_msg msg = { .addr = priv->i2c_addr, .flags = 0,
                                .buf = buf, .len = sizeof(buf) };
 
+        if (NULL == priv->cfg) {
+                dprintk("tda827x_config not defined, cannot set LNA gain!\n");
+                return;
+        }
+
         if (priv->cfg->config) {
                 if (high)
                         dprintk("setting LNA to high gain\n");