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avcodec/dxv: Check coded_height, to avoid invalid av_clip()

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Fixes: assertion failure
Fixes: 438961582/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXV_DEC_fuzzer-5850827739955200

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 cdee519d40)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-08-19 03:12:37 +02:00
parent 647b235ec1
commit c8d0bb8966
1 changed files with 2 additions and 0 deletions
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2
libavcodec/dxv.c
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@@ -1147,6 +1147,8 @@ static int dxv_decode(AVCodecContext *avctx, AVFrame *frame,
ctx->tex_rat = 1;
break;
}
if (avctx->coded_height / 2 / TEXTURE_BLOCK_H < 1)
return AVERROR_INVALIDDATA;
ctx->slice_count = av_clip(avctx->thread_count, 1,
avctx->coded_height / FFMAX(ctx->texture_block_h,