[FFmpeg-cvslog] qtrle: add more checks against pixel_ptr being negative.

[Anton Khirnov]

ffmpeg | branch: release/1.1 | Anton Khirnov <anton at khirnov.net> | Thu Feb 14 17:58:12 2013 +0100| [a6403a3b69174363bff5edc85314f6d3fbba1ba1] | committer: Reinhard Tartler

qtrle: add more checks against pixel_ptr being negative.

CC:libav-stable at libav.org
(cherry picked from commit e10659244782b26061e7d52c06437de32a43a7af)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a6403a3b69174363bff5edc85314f6d3fbba1ba1
---

 libavcodec/qtrle.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/qtrle.c b/libavcodec/qtrle.c
index 2a83bdb..23b2a61 100644
--- a/libavcodec/qtrle.c
+++ b/libavcodec/qtrle.c
@@ -117,6 +117,7 @@ static inline void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr,
 
     while (lines_to_change--) {
         pixel_ptr = row_ptr + (num_pixels * (bytestream2_get_byte(&s->g) - 1));
+        CHECK_PIXEL_PTR(0);
 
         while ((rle_code = (signed char)bytestream2_get_byte(&s->g)) != -1) {
             if (rle_code == 0) {
@@ -171,6 +172,7 @@ static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)
 
     while (lines_to_change--) {
         pixel_ptr = row_ptr + (4 * (bytestream2_get_byte(&s->g) - 1));
+        CHECK_PIXEL_PTR(0);
 
         while ((rle_code = (signed char)bytestream2_get_byte(&s->g)) != -1) {
             if (rle_code == 0) {
@@ -220,6 +222,7 @@ static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change
 
     while (lines_to_change--) {
         pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 2;
+        CHECK_PIXEL_PTR(0);
 
         while ((rle_code = (signed char)bytestream2_get_byte(&s->g)) != -1) {
             if (rle_code == 0) {
@@ -263,6 +266,7 @@ static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change
 
     while (lines_to_change--) {
         pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 3;
+        CHECK_PIXEL_PTR(0);
 
         while ((rle_code = (signed char)bytestream2_get_byte(&s->g)) != -1) {
             if (rle_code == 0) {
@@ -309,6 +313,7 @@ static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change
 
     while (lines_to_change--) {
         pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 4;
+        CHECK_PIXEL_PTR(0);
 
         while ((rle_code = (signed char)bytestream2_get_byte(&s->g)) != -1) {
             if (rle_code == 0) {