binkaudio: prevent extradata overread

Signed-off-by: Paul B Mahol <onemda@gmail.com>
13 years ago · c2dd01c16f
parent 6fef82f22d
commit c2dd01c16f
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/binkaudio.c
+++ b/libavcodec/binkaudio.c
@ -96,7 +96,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
        return AVERROR_INVALIDDATA;
    }

-    s->version_b = avctx->extradata && avctx->extradata[3] == 'b';
+    s->version_b = avctx->extradata_size >= 4 && avctx->extradata[3] == 'b';

    if (avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT) {
        // audio is already interleaved for the RDFT format variant