[FFmpeg-cvslog] Fix some loop conditions to prevent overreads

[Mashiat Sarker Shakkhar]

ffmpeg | branch: master | Mashiat Sarker Shakkhar <shahriman_ams at yahoo.com> | Tue Nov 22 01:01:30 2011 +0600| [6cf31ef263d36f6b89d9b64f15ca81cef4f24901] | committer: Mashiat Sarker Shakkhar

Fix some loop conditions to prevent overreads

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6cf31ef263d36f6b89d9b64f15ca81cef4f24901
---

 libavcodec/wmalosslessdec.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index 5b11d7d..051ad1a 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -857,7 +857,7 @@ static void use_high_update_speed(WmallDecodeCtx *s, int ich)
 {
     int ilms, recent, icoef;
     s->update_speed[ich] = 16;
-    for (ilms = s->cdlms_ttl[ich]; ilms >= 0; ilms--) {
+    for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
         recent = s->cdlms[ich][ilms].recent;
         if (s->bV3RTM) {
             for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
@@ -873,7 +873,7 @@ static void use_normal_update_speed(WmallDecodeCtx *s, int ich)
 {
     int ilms, recent, icoef;
     s->update_speed[ich] = 8;
-    for (ilms = s->cdlms_ttl[ich]; ilms >= 0; ilms--) {
+    for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
         recent = s->cdlms[ich][ilms].recent;
         if (s->bV3RTM) {
             for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
@@ -901,7 +901,7 @@ static void revert_cdlms(WmallDecodeCtx *s, int tile_size)
                 s->transient[ich] = 1;
                 use_high_update_speed(s, ich);
             }
-            for (ilms = num_lms; ilms >= 0; ilms--) {
+            for (ilms = num_lms - 1; ilms >= 0; ilms--) {
                 pred = lms_predict(s, ich, ilms);
                 channel_coeff += pred;
                 lms_update(s, ich, ilms, channel_coeff, pred);