[FFmpeg-cvslog] Fixed invalid writes in wavpack decoder on corrupted bitstreams.

[Laurent Aimar]

ffmpeg | branch: release/0.8 | Laurent Aimar <fenrir at videolan.org> | Wed Sep  7 22:17:39 2011 +0200| [558cf502acdb1743921a212804199d650deaeaeb] | committer: Michael Niedermayer

Fixed invalid writes in wavpack decoder on corrupted bitstreams.

Signed-off-by: Martin Storsjö <martin at martin.st>
(cherry picked from commit 0aedab03405849962b469277afe047aa2c61a87f)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=558cf502acdb1743921a212804199d650deaeaeb
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 61a75fd..1e6d857 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -1141,7 +1141,7 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
             int16_t *dst = (int16_t*)samples + 1;
             int16_t *src = (int16_t*)samples;
             int cnt = samplecount;
-            while(cnt--){
+            while(cnt-- > 0){
                 *dst = *src;
                 src += channel_stride;
                 dst += channel_stride;
@@ -1150,7 +1150,7 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
             int32_t *dst = (int32_t*)samples + 1;
             int32_t *src = (int32_t*)samples;
             int cnt = samplecount;
-            while(cnt--){
+            while(cnt-- > 0){
                 *dst = *src;
                 src += channel_stride;
                 dst += channel_stride;
@@ -1159,7 +1159,7 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
             float *dst = (float*)samples + 1;
             float *src = (float*)samples;
             int cnt = samplecount;
-            while(cnt--){
+            while(cnt-- > 0){
                 *dst = *src;
                 src += channel_stride;
                 dst += channel_stride;