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avcodec/mdec: Check input space vs minimal block size

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Fixes: Timeout
Fixes: 481006706/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MDEC_fuzzer-6122832651419648

Found-by:  continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 40cafc25cf)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2026-02-06 22:37:53 +01:00
parent 45a1754971
commit db4555e244
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3
libavcodec/mdec.c
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@ -174,6 +174,9 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
int buf_size = avpkt->size;
int ret;
if (a->mb_width * a->mb_height * 3 > buf_size)
return AVERROR_INVALIDDATA;
if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
return ret;
frame->pict_type = AV_PICTURE_TYPE_I;