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aacsbr: prevent out of bounds memcpy().

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Fixes Libav Bug 195.
Fixes CVE-2012-0850

This doesn't make the code handle sample rate or upsample/downsample
change properly but this is still a good sanity check.

Based on change by Michael Niedermayer.

Signed-off-by: Alex Converse <alex.converse@gmail.com>
(cherry picked from commit 17ce52912f)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Alex Converse 2012-01-10 13:07:09 -08:00 committed by Reinhard Tartler
parent b15e85d820
commit d87997b56f
1 changed files with 4 additions and 3 deletions
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7
libavcodec/aacsbr.c
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@ -1181,14 +1181,15 @@ static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
{
int i, n;
const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
const int step = 128 >> div;
float *v;
for (i = 0; i < 32; i++) {
if (*v_off == 0) {
if (*v_off < step) {
int saved_samples = (1280 - 128) >> div;
memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
*v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
*v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
} else {
*v_off -= 128 >> div;
*v_off -= step;
}
v = v0 + *v_off;
if (div) {