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dv: Fix out of array read

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Fixes part of CVE-2011-3936

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-25 04:51:06 +01:00
parent 8847561f93
commit 88d84dd8ea
1 changed files with 6 additions and 4 deletions
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10
libavformat/dv.c
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@ -35,6 +35,7 @@
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "dv.h"
#include "libavutil/avassert.h"
struct DVDemuxContext {
const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
@ -130,15 +131,19 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* ppcm[4],
/* We work with 720p frames split in half, thus even frames have
* channels 0,1 and odd 2,3. */
ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0;
pcm = ppcm[ipcm++];
/* for each DIF channel */
for (chan = 0; chan < sys->n_difchan; chan++) {
av_assert0(ipcm<4);
pcm = ppcm[ipcm++];
if (!pcm)
break;
/* for each DIF segment */
for (i = 0; i < sys->difseg_size; i++) {
frame += 6 * 80; /* skip DIF segment header */
if (quant == 1 && i == half_ch) {
/* next stereo channel (12bit mode only) */
av_assert0(ipcm<4);
pcm = ppcm[ipcm++];
if (!pcm)
break;
@ -183,9 +188,6 @@ static int dv_extract_audio(uint8_t* frame, uint8_t* ppcm[4],
}
/* next stereo channel (50Mbps and 100Mbps only) */
pcm = ppcm[ipcm++];
if (!pcm)
break;
}
return size;