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avcodec/dvbsubdec: Check entry_id
Fixes: randomly writing over the array end
Fixes: 1473/clusterfuzz-testcase-minimized-5768907824562176
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 8a69f2602f
)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -1160,9 +1160,9 @@ static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
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return AVERROR_INVALIDDATA;
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}
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if (depth & 0x80)
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if (depth & 0x80 && entry_id < 4)
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clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
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else if (depth & 0x40)
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else if (depth & 0x40 && entry_id < 16)
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clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
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else if (depth & 0x20)
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clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
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