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avcodec/prores_raw: Tiles of width less than 16 result in undefined behavior

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Fixes: passing zero to __builtin_clz(), which is not a valid argument
Fixes: 471569982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PRORES_RAW_DEC_fuzzer-5832576221904896

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
2026-02-13 00:06:26 +01:00
committed by michaelni
parent 2ad078b589
commit be1fd6d9d4
1 changed files with 3 additions and 0 deletions
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3
libavcodec/prores_raw.c
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@@ -461,6 +461,9 @@ static int decode_frame(AVCodecContext *avctx,
tile->y = (n / s->nb_tw) * s->th;
tile->x = (n % s->nb_tw) * s->tw;
if (avctx->width - tile->x < 16)
return AVERROR_PATCHWELCOME;
offset += size;
}