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avcodec/jpeg2000dec: check len before parsing header

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Fixes out of array read

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-14 19:20:10 +02:00
parent 5deb96c564
commit 69e4d8e6a4
1 changed files with 2 additions and 2 deletions
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4
libavcodec/jpeg2000dec.c
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@ -1249,9 +1249,9 @@ static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
if (marker == JPEG2000_EOC)
break;
if (bytestream2_get_bytes_left(&s->g) < 2)
len = bytestream2_get_be16(&s->g);
if (len < 2 || bytestream2_get_bytes_left(&s->g) < len - 2)
return AVERROR(EINVAL);
len = bytestream2_get_be16u(&s->g);
switch (marker) {
case JPEG2000_SIZ:
ret = get_siz(s);