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avcodec/mjpegdec: Check len in ff_mjpeg_decode_dht()

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Fixes CID1239167

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2015-05-13 17:41:41 +02:00
parent dc35a58149
commit cf9ab119d0
1 changed files with 5 additions and 0 deletions
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5
libavcodec/mjpegdec.c
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@@ -204,6 +204,11 @@ int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
len = get_bits(&s->gb, 16) - 2;
if (8*len > get_bits_left(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR, "dht: len %d is too large\n", len);
return AVERROR_INVALIDDATA;
}
while (len > 0) {
if (len < 17)
return AVERROR_INVALIDDATA;