[FFmpeg-cvslog] qtrle: check for out of bound writes.

[Laurent Aimar]

ffmpeg | branch: release/0.8 | Laurent Aimar <fenrir at videolan.org> | Sat Oct  8 23:40:36 2011 +0200| [a65045915f5b4ec6da73df54d1914b320a861223] | committer: Michael Niedermayer

qtrle: check for out of bound writes.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 7fb92be7e50ea4ba5712804326c6814ae02dd190)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a65045915f5b4ec6da73df54d1914b320a861223
---

 libavcodec/qtrle.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/libavcodec/qtrle.c b/libavcodec/qtrle.c
index 0f280f5..124106f 100644
--- a/libavcodec/qtrle.c
+++ b/libavcodec/qtrle.c
@@ -127,6 +127,7 @@ static inline void qtrle_decode_2n4bpp(QtrleContext *s, int stream_ptr,
     while (lines_to_change--) {
         CHECK_STREAM_PTR(2);
         pixel_ptr = row_ptr + (num_pixels * (s->buf[stream_ptr++] - 1));
+        CHECK_PIXEL_PTR(0);  /* make sure pixel_ptr is positive */
 
         while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
             if (rle_code == 0) {
@@ -183,6 +184,7 @@ static void qtrle_decode_8bpp(QtrleContext *s, int stream_ptr, int row_ptr, int
     while (lines_to_change--) {
         CHECK_STREAM_PTR(2);
         pixel_ptr = row_ptr + (4 * (s->buf[stream_ptr++] - 1));
+        CHECK_PIXEL_PTR(0);  /* make sure pixel_ptr is positive */
 
         while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
             if (rle_code == 0) {
@@ -236,6 +238,7 @@ static void qtrle_decode_16bpp(QtrleContext *s, int stream_ptr, int row_ptr, int
     while (lines_to_change--) {
         CHECK_STREAM_PTR(2);
         pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 2;
+        CHECK_PIXEL_PTR(0);  /* make sure pixel_ptr is positive */
 
         while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
             if (rle_code == 0) {
@@ -285,6 +288,7 @@ static void qtrle_decode_24bpp(QtrleContext *s, int stream_ptr, int row_ptr, int
     while (lines_to_change--) {
         CHECK_STREAM_PTR(2);
         pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 3;
+        CHECK_PIXEL_PTR(0);  /* make sure pixel_ptr is positive */
 
         while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
             if (rle_code == 0) {
@@ -336,6 +340,7 @@ static void qtrle_decode_32bpp(QtrleContext *s, int stream_ptr, int row_ptr, int
     while (lines_to_change--) {
         CHECK_STREAM_PTR(2);
         pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 4;
+        CHECK_PIXEL_PTR(0);  /* make sure pixel_ptr is positive */
 
         while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
             if (rle_code == 0) {