[FFmpeg-devel] [PATCH] Check for invalid VLC code in zeros_left before writing coefficients.

[Ronald S. Bultje]

Hi,

On Sun, Dec 9, 2012 at 4:05 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
> Hi
>
> On Fri, Dec 07, 2012 at 01:09:20PM -0800, Ronald S. Bultje wrote:
>> From: "Ronald S. Bultje" <rsbultje at gmail.com>
>>
>> This prevents an invalid write into coeffs[scantable[-1]] if zeros_left
>> itself was an invalid VLC code (and thus -1).
>
> scantable[-1] has to be a value between 0 and 255 as its uint8_t
> coeffs is supposed to be at least 256 entries large for exactly that
> reason

Accessing scantable[-1] is no less valid depending on the type of scantable.

But do as you wish.

Ronald