The length does not cover the chunk type or CRC.
---
libavcodec/pngdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index f3295688c6..0ff81d740c 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -1217,7 +1217,7 @@ static int decode_frame_common(AVCodecContext *avctx,
PNGDecContext *s,
}
length = bytestream2_get_be32(&s->gb);
- if (length > 0x7fffffff || length >
bytestream2_get_bytes_left(&s->gb)) {
+ if (length > 0x7fffffff || length + 8 >
bytestream2_get_bytes_left(&s->gb)) {
av_log(avctx, AV_LOG_ERROR, "chunk too big\n");
ret = AVERROR_INVALIDDATA;
goto fail;
--
2.30.2
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