Bug#677035: libavcodec52: SEGV when encoding video

[Reinhard Tartler]

tag 677035 upstream
stop

On Mon, Jun 11, 2012 at 3:04 PM,  <g.bonacci at libero.it> wrote:
> On Mon, Jun 11, 2012 at 12:05:05PM +0200, Reinhard Tartler wrote:
>>
>> In order to check if that bug has already been fixed upstream, could
>> you please install the libavcodec-extra-53 package from backports.org
>> and check if the segmentation fault still occurs?
>>
>
> I've just tried libav-tools 4:0.8-2~bpo60+1 and libavcodec53 segfaults too, so
> perhaps the problem is present upstream.
>
> After my submission, I've noticed that it crashes with horizontal sizes
> 626, 632, and 852, but not with sizes 624 and 640.
>
> Coupled with the name of the top-of-stack function (sad16_sse2), that suggests
> a workaround: use horizontal sizes that are multiples of 16.
>
> Although I've had no time to examine the code (and I'm no expert in assembly)
> I guess that the problem might be caused by a wrongly aligned or sized buffer.

That's an interesting observation. This bug needs to be forwarded upstream.
http://bugzilla.libav.org

-- 
regards,
    Reinhard