From: Michael Krufky <mkrufky@linuxtv.org>
Date: Thu, 22 Nov 2007 17:40:25 +0000 (-0300)
Subject: V4L/DVB (6622): tda827x: prevent possible NULL pointer dereference in tda827xa_lna_gain
X-Git-Tag: v2.6.25-rc1~1235^2~350
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=255c1887ccca6cde4a2eac231623b925bf621540;p=linux-2.6

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 50adfb5395..229b11987a 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");