Re: [linuxtv-commits] [hg:v4l-dvb] DVB: negative internal->sub_range won't get noticed

[Manu Abraham <abraham.manu@gmail.com>]

Mauro,

Please revert this patch as it is incorrect. A correct version is
available at http://jusst.de/hg/v4l-dvb which is undergoing tests.
http://jusst.de/hg/v4l-dvb/rev/368dc6078295

Why did you have to hastily apply this patch, especially when i
mentioned this earlier ?

Regards,
Manu


Patch from Roel Kluin wrote:
> The patch number 10393 was added via Mauro Carvalho Chehab <mchehab@redhat.com>
> to http://linuxtv.org/hg/v4l-dvb master development tree.
> 
> Kernel patches in this development tree may be modified to be backward
> compatible with older kernels. Compatibility modifications will be
> removed before inclusion into the mainstream Kernel
> 
> If anyone has any objections, please let us know by sending a message to:
> 	Linux Media Mailing List <linux-media@vger.kernel.org>
> 
> ------
> 
> From: Roel Kluin  <roel.kluin@gmail.com>
> DVB: negative internal->sub_range won't get noticed
> 
> 
> internal->sub_range is unsigned, a negative won't get noticed.
> 
> Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
> 
> 
> ---
> 
>  linux/drivers/media/dvb/frontends/stb0899_algo.c |    9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff -r 6ca70bcb4972 -r d3bfc53d0b67 linux/drivers/media/dvb/frontends/stb0899_algo.c
> --- a/linux/drivers/media/dvb/frontends/stb0899_algo.c	Wed Jan 14 16:17:59 2009 +0000
> +++ b/linux/drivers/media/dvb/frontends/stb0899_algo.c	Sun Jan 18 23:31:26 2009 +0000
> @@ -467,12 +467,13 @@ static void next_sub_range(struct stb089
>  
>  	if (internal->sub_dir > 0) {
>  		old_sub_range = internal->sub_range;
> -		internal->sub_range = MIN((internal->srch_range / 2) -
> +		if (internal->tuner_offst + internal->sub_range / 2 >=
> +				internal->srch_range / 2)
> +			internal->sub_range = 0;
> +		else
> +			internal->sub_range = MIN((internal->srch_range / 2) -
>  					  (internal->tuner_offst + internal->sub_range / 2),
>  					   internal->sub_range);
> -
> -		if (internal->sub_range < 0)
> -			internal->sub_range = 0;
>  
>  		internal->tuner_offst += (old_sub_range + internal->sub_range) / 2;
>  	}
> 
> 
> ---
> 
> Patch is available at: http://linuxtv.org/hg/v4l-dvb/rev/d3bfc53d0b678da495fd2b559e154c5e95584079
> 
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