linux-kernel - Re: [2.6 patch] ivtv: fix NULL dereference

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Message-Id: <200710142003.20323.hverkuil@xs4all.nl>
Date:	Sun, 14 Oct 2007 20:03:20 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	v4l-dvb-maintainer@...uxtv.org, linux-kernel@...r.kernel.org
Subject: Re: [2.6 patch] ivtv: fix NULL dereference

On Sunday 14 October 2007 19:51:37 Adrian Bunk wrote:
> We shouldn't dereference "itv" when we know it's NULL...
>
> Spotted by the Coverity checker.
>
> Signed-off-by: Adrian Bunk <bunk@...nel.org>
>
> ---
> --- linux-2.6/drivers/media/video/ivtv/ivtv-fileops.c.old	2007-10-14
> 19:17:12.000000000 +0200 +++
> linux-2.6/drivers/media/video/ivtv/ivtv-fileops.c	2007-10-14
> 19:18:05.000000000 +0200 @@ -947,7 +947,7 @@ int
> ivtv_v4l2_open(struct inode *inode,
>  	if (itv == NULL) {
>  		/* Couldn't find a device registered
>  		   on that minor, shouldn't happen! */
> -		IVTV_WARN("No ivtv device found on minor %d\n", minor);
> +		printk(KERN_WARNING "No ivtv device found on minor %d\n", minor);
>  		return -ENXIO;
>  	}


Signed-off-by: Hans Verkuil <hverkuil@...all.nl>

Luckily this is something that 'shoudn't happen' :-)
Oddly enough it is correct in my standalone driver.

Mauro, can you merge this with 2.6.24 as well? Or shall I add it to my 
ivtv tree with my other outstanding fixes?

Regards,

	Hans
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