On 12/22/2019 12:26 PM, Zhong Li wrote:
> Signed-off-by: Zhong Li <zhongli_...@126.com>
> ---
> libavcodec/midivid.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/libavcodec/midivid.c b/libavcodec/midivid.c
> index 38465c5..3dac3f1 100644
> --- a/libavcodec/midivid.c
> +++ b/libavcodec/midivid.c
> @@ -63,17 +63,20 @@ static int decode_mvdv(MidiVidContext *s, AVCodecContext
> *avctx, AVFrame *frame)
> if (intra_flag) {
> nb_blocks = (avctx->width / 2) * (avctx->height / 2);
> } else {
> - int skip_linesize;
> + int ret, skip_linesize;
>
> nb_blocks = bytestream2_get_le32(gb);
> skip_linesize = avctx->width >> 1;
> mask_start = gb->buffer_start + bytestream2_tell(gb);
> mask_size = (avctx->width >> 5) * (avctx->height >> 2);
>
> - if (bytestream2_get_bytes_left(gb) < mask_size)
> + ret = bytestream2_get_bytes_left(gb);
> + if (ret < mask_size)
What is this fixing?
> return AVERROR_INVALIDDATA;
>
> - init_get_bits8(&mask, mask_start, mask_size);
> + ret = init_get_bits8(&mask, mask_start, mask_size);
> + if (ret < 0)
> + return AVERROR_INVALIDDATA;
> bytestream2_skip(gb, mask_size);
> skip = s->skip;
>
>
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