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avcodec/eacmv: Check input size for intra frames

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Fixes: Timeout
Fixes: 71135/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EACMV_fuzzer-6251879028293632

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 c3a1cbbf5d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2024-09-19 23:57:31 +02:00
parent b18ca50c9a
commit 4d166d3758
1 changed files with 4 additions and 1 deletions
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5
libavcodec/eacmv.c
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@@ -195,12 +195,15 @@ static int cmv_decode_frame(AVCodecContext *avctx,
if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)
return ret;
buf += EA_PREAMBLE_SIZE;
if (!(buf[0]&1) && buf_end - buf < s->width * s->height * (int64_t)(100 - s->avctx->discard_damaged_percentage) / 100)
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
buf += EA_PREAMBLE_SIZE;
if ((buf[0]&1)) { // subtype
cmv_decode_inter(s, frame, buf+2, buf_end);
frame->key_frame = 0;