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avcodec/ivi: Check luma/chroma mb_size

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Fixes: shift exponent -1 is negative
Fixes: 429011224/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INDEO5_fuzzer-5031059358285824

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2025-07-15 23:28:09 +02:00
parent 2d72bf6fe0
commit c0f1c3e185
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GPG key ID: B18E8928B3948D64
1 changed files with 5 additions and 3 deletions
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8
libavcodec/ivi.c
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@ -994,9 +994,11 @@ static int decode_band(IVI45DecContext *ctx,
for (t = 0; t < band->num_tiles; t++) {
tile = &band->tiles[t];
if (tile->mb_size != band->mb_size) {
av_log(avctx, AV_LOG_ERROR, "MB sizes mismatch: %d vs. %d\n",
band->mb_size, tile->mb_size);
if (tile->mb_size != band->mb_size ||
ctx->planes[0].bands[0].mb_size < band->mb_size
) {
av_log(avctx, AV_LOG_ERROR, "MB sizes mismatch: %d vs. %d vs. %d\n",
band->mb_size, tile->mb_size, ctx->planes[0].bands[0].mb_size);
return AVERROR_INVALIDDATA;
}
tile->is_empty = get_bits1(&ctx->gb);