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wmadec: fix off by 1 error on the pow_tab index check.

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Fixes global 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 2012-03-02 16:44:49 +01:00
parent a5bf9b351c
commit d964db5742
1 changed files with 1 additions and 1 deletions
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2
libavcodec/wmadec.c
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@ -368,7 +368,7 @@ static int decode_exp_vlc(WMACodecContext *s, int ch)
}
/* NOTE: this offset is the same as MPEG4 AAC ! */
last_exp += code - 60;
if ((unsigned)last_exp + 60 > FF_ARRAY_ELEMS(pow_tab)) {
if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
last_exp);
return -1;