linux-kernel - [109/129] [media] cx23885-dvb: check if dvb

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Message-Id: <20120124023933.632181885@clark.kroah.org>
Date:	Mon, 23 Jan 2012 18:35:29 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Miroslav Slugen <thunder.mmm@...il.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: [109/129] [media] cx23885-dvb: check if dvb_attach() succeded

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 890
Lines: 30

From: Miroslav Slugen <thunder.mmm@...il.com>

commit a7c8aadad39428b64d26c3971d967f8314e2397d upstream.

Fix possible null dereference for Leadtek DTV 3200H
XC4000 tuner when no firmware file available.

Signed-off-by: Miroslav Slugen <thunder.mmm@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/media/video/cx23885/cx23885-dvb.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/media/video/cx23885/cx23885-dvb.c
+++ b/drivers/media/video/cx23885/cx23885-dvb.c
@@ -940,6 +940,11 @@ static int dvb_register(struct cx23885_t
 
 			fe = dvb_attach(xc4000_attach, fe0->dvb.frontend,
 					&dev->i2c_bus[1].i2c_adap, &cfg);
+			if (!fe) {
+				printk(KERN_ERR "%s/2: xc4000 attach failed\n",
+				       dev->name);
+				goto frontend_detach;
+			}
 		}
 		break;
 	case CX23885_BOARD_TBS_6920:


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