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lavc/pngdec: improve chunk length check
The length does not cover the chunk type or CRC.
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@ -1217,7 +1217,7 @@ static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
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}
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length = bytestream2_get_be32(&s->gb);
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if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) {
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if (length > 0x7fffffff || length + 8 > bytestream2_get_bytes_left(&s->gb)) {
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av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
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ret = AVERROR_INVALIDDATA;
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goto fail;
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