[FFmpeg-devel] [PATCH 4/8] avcodec/ffv1dec: Fix off by 1 error with quant tables

[Paul B Mahol]

Trivially ok

On Sat, Dec 19, 2020 at 1:42 AM Michael Niedermayer <michael at niedermayer.cc>
wrote:

> Fixes: assertion failure
> Fixes:
> 28447/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-5369575948550144
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by
> <https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by>:
> Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/ffv1dec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
> index c704373cfe..0a3f425493 100644
> --- a/libavcodec/ffv1dec.c
> +++ b/libavcodec/ffv1dec.c
> @@ -786,7 +786,7 @@ static int read_header(FFV1Context *f)
>
>              if (f->version == 2) {
>                  int idx = get_symbol(c, state, 0);
> -                if (idx > (unsigned)f->quant_table_count) {
> +                if (idx >= (unsigned)f->quant_table_count) {
>                      av_log(f->avctx, AV_LOG_ERROR,
>                             "quant_table_index out of range\n");
>                      return AVERROR_INVALIDDATA;
> --
> 2.17.1
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".