linux-kernel - [PATCH] drivers/media/pci/saa7134/saa7134-dvb.c: Test if videobuf_dvb_get

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Date:	Tue, 30 Oct 2012 16:09:41 +0100
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	mchehab@...radead.org
Cc:	crope@....fi, remi.schwartz@...il.com, kyle@...e.strickland.name,
	pinusdtv@...mail.com, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH] drivers/media/pci/saa7134/saa7134-dvb.c: Test if videobuf_dvb_get_frontend return NULL

Based on commit: e66131cee501ee720b7b58a4b87073b8fbaaaba6

Not testing videobuf_dvb_get_frontend output may cause OOPS if it return
NULL. This patch fixes this issue.

The semantic patch that found this issue is(http://coccinelle.lip6.fr/):
// <smpl>
@@
identifier i,a,b;
statement S, S2;
@@
i = videobuf_dvb_get_frontend(...);
... when != if (!i) S
* if (i->a.b)
S2
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
---
 drivers/media/pci/saa7134/saa7134-dvb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/pci/saa7134/saa7134-dvb.c b/drivers/media/pci/saa7134/saa7134-dvb.c
index b209de4..27915e5 100644
--- a/drivers/media/pci/saa7134/saa7134-dvb.c
+++ b/drivers/media/pci/saa7134/saa7134-dvb.c
@@ -607,6 +607,9 @@ static int configure_tda827x_fe(struct saa7134_dev *dev,
 	/* Get the first frontend */
 	fe0 = videobuf_dvb_get_frontend(&dev->frontends, 1);
 
+	if (!fe0)
+		return -EINVAL;
+
 	fe0->dvb.frontend = dvb_attach(tda10046_attach, cdec_conf, &dev->i2c_adap);
 	if (fe0->dvb.frontend) {
 		if (cdec_conf->i2c_gate)
-- 
1.7.11.7

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