[FFmpeg-cvslog] aacsbr: Fix memory corruption.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Thu Dec 15 03:59:29 2011 +0100| [944f5b2779e4aa63f7624df6cd4de832a53db81b] | committer: Michael Niedermayer

aacsbr: Fix memory corruption.
Fixes Ticket760 and Ticket761
Bug Found by: Diana Elena Muscalu

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=944f5b2779e4aa63f7624df6cd4de832a53db81b
---

 libavcodec/aacsbr.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/aacsbr.c b/libavcodec/aacsbr.c
index a213827..d2f37c5 100644
--- a/libavcodec/aacsbr.c
+++ b/libavcodec/aacsbr.c
@@ -1187,7 +1187,7 @@ static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
     const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
     float *v;
     for (i = 0; i < 32; i++) {
-        if (*v_off == 0) {
+        if (*v_off < 128 >> div) {
             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);