[FFmpeg-devel] [PATCH] Fix invalid reads in VC1 decoder

[Kostya]

On Sat, Feb 19, 2011 at 12:16:53PM +0100, Reinhard Tartler wrote:
> From: Reimar D?ffinger <Reimar.Doeffinger at gmx.de>
> 
> Patch discussed and taken from https://roundup.ffmpeg.org/issue2584
> ---
>  libavcodec/vc1dec.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index 6707cde..7eb9576 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -1376,7 +1376,7 @@ static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value,
>      if (index != vc1_ac_sizes[codingset] - 1) {
>          run = vc1_index_decode_table[codingset][index][0];
>          level = vc1_index_decode_table[codingset][index][1];
> -        lst = index >= vc1_last_decode_table[codingset];
> +        lst = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;
>          if(get_bits1(gb))
>              level = -level;
>      } else {
> -- 
> 1.7.0.4

fine