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avcodec/bintext: Check font height

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Fixes: division by zero
Fixes: 15257/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BINTEXT_fuzzer-5757352881422336

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 2019-06-16 16:01:45 +02:00
parent 7a072fbcc4
commit bfb58bdd70
1 changed files with 4 additions and 0 deletions
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4
libavcodec/bintext.c
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@ -63,6 +63,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
av_log(avctx, AV_LOG_ERROR, "not enough extradata\n"); av_log(avctx, AV_LOG_ERROR, "not enough extradata\n");
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }
if (!s->font_height) {
av_log(avctx, AV_LOG_ERROR, "invalid font height\n");
return AVERROR_INVALIDDATA;
}
} else { } else {
s->font_height = 8; s->font_height = 8;
s->flags = 0; s->flags = 0;