[FFmpeg-devel] [PATCH 1/2] MxPEG decoder

[Anatoly Nenashev]

On 25.11.2010 18:26, Michael Niedermayer wrote:
> On Mon, Nov 08, 2010 at 01:40:39PM +0300, Anatoly Nenashev wrote:
>    
>> [...]
>> I think I've found a solution for this issue. If input packet doesn't
>> contain SOF data then the new picture is allocated from
>> reference_picture which is initiated at decode_frame end. Thus
>> reference_picture is always good. For more details see attachment.
>>      
>
> the issue i described has not been fixed
> a invalid SOF still can lead to inconsistant values and your code still naively
> sets got_picture=1 indicating a valid SOF even if that is not so.
>
> Fundamentally i think the problem is that you write the code while ignoring
> security aspects entirely and expect review to find security issues.
> You should make sure your code is secure and no crafted input no matter how
> evil and malformed can lead to any crash or exploit before you submit your
> code.
>
>
> [...]
>    
>

I've reimplemented decoder to be more secure. There is additional flag 
named "got_sof_data" which shows that SOF data is succesfully parsed.
Also ugly picture reallocation removed.


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