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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>
This commit is contained in:
Michael Niedermayer 2017-05-11 15:18:50 +02:00
parent 3f8882fa5b
commit 542f44aff0
1 changed files with 2 additions and 2 deletions
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4
libavcodec/dvbsubdec.c
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@ -1115,9 +1115,9 @@ static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
return AVERROR_INVALIDDATA;
}
if (depth & 0x80)
if (depth & 0x80 && entry_id < 4)
clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
else if (depth & 0x40)
else if (depth & 0x40 && entry_id < 16)
clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
else if (depth & 0x20)
clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);