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avcodec/mjpegdec: Explain buf_size/width/height check

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Suggested-by: Ramiro

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 61b6877637)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-09-11 20:12:55 +02:00
parent a7f9caa662
commit 9f6c98a32e
1 changed files with 2 additions and 0 deletions
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2
libavcodec/mjpegdec.c
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@@ -343,6 +343,8 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
if (av_image_check_size(width, height, 0, s->avctx) < 0)
return AVERROR_INVALIDDATA;
// A valid frame requires at least 1 bit for DC + 1 bit for AC for each 8x8 block.
if (s->buf_size && (width + 7) / 8 * ((height + 7) / 8) > s->buf_size * 4LL)
return AVERROR_INVALIDDATA;