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>

diff --git a/drivers/media/dvb/frontends/tda827x.c b/drivers/media/dvb/frontends/tda827x.c
index 50adfb5395ecc70f5a6f14eee3465c855711db8e..229b11987a589fed652c00934c91101f59867eeb 100644 (file)
--- 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");