[gdk-pixbuf] ico: Protect against overflow

[Benjamin Otte <otte src gnome org>]

commit 7b10db13ff370bf2500688054249101ff175a942
Author: Benjamin Otte <otte redhat com>
Date:   Mon Oct 12 14:46:59 2015 +0200

    ico: Protect against overflow

 gdk-pixbuf/io-ico.c |   32 +++++++++++++++++---------------
 1 files changed, 17 insertions(+), 15 deletions(-)
---
diff --git a/gdk-pixbuf/io-ico.c b/gdk-pixbuf/io-ico.c
index e4faef5..c60dec2 100644
--- a/gdk-pixbuf/io-ico.c
+++ b/gdk-pixbuf/io-ico.c
@@ -579,11 +579,11 @@ OneLine32 (struct ico_progressive_state *context)
         X = 0;
         if (context->Header.Negative == 0)
                 Pixels = (context->pixbuf->pixels +
-                          context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                           (context->Header.height - context->Lines - 1));
         else
                 Pixels = (context->pixbuf->pixels +
-                          context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                           context->Lines);
         while (X < context->Header.width) {
                 Pixels[X * 4 + 0] = context->LineBuf[X * 4 + 2];
@@ -602,11 +602,11 @@ static void OneLine24(struct ico_progressive_state *context)
        X = 0;
        if (context->Header.Negative == 0)
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          (context->Header.height - context->Lines - 1));
        else
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          context->Lines);
        while (X < context->Header.width) {
                Pixels[X * 4 + 0] = context->LineBuf[X * 3 + 2];
@@ -626,10 +626,12 @@ OneLine16 (struct ico_progressive_state *context)
 
         if (context->Header.Negative == 0)
                 pixels = (context->pixbuf->pixels +
-                          context->pixbuf->rowstride * (context->Header.height - context->Lines - 1));
+                         (gsize) context->pixbuf->rowstride *
+                          (context->Header.height - context->Lines - 1));
         else
                 pixels = (context->pixbuf->pixels +
-                          context->pixbuf->rowstride * context->Lines);
+                         (gsize) context->pixbuf->rowstride *
+                          context->Lines);
 
         src = context->LineBuf;
 
@@ -663,11 +665,11 @@ static void OneLine8(struct ico_progressive_state *context)
        X = 0;
        if (context->Header.Negative == 0)
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          (context->Header.height - context->Lines - 1));
        else
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          context->Lines);
        while (X < context->Header.width) {
                /* The joys of having a BGR byteorder */
@@ -688,11 +690,11 @@ static void OneLine4(struct ico_progressive_state *context)
        X = 0;
        if (context->Header.Negative == 0)
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          (context->Header.height - context->Lines - 1));
        else
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          context->Lines);
        
        while (X < context->Header.width) {
@@ -729,11 +731,11 @@ static void OneLine1(struct ico_progressive_state *context)
        X = 0;
        if (context->Header.Negative == 0)
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          (context->Header.height - context->Lines - 1));
        else
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          context->Lines);
        while (X < context->Header.width) {
                int Bit;
@@ -760,11 +762,11 @@ static void OneLineTransp(struct ico_progressive_state *context)
        X = 0;
        if (context->Header.Negative == 0)
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          (2*context->Header.height - context->Lines - 1));
        else
                Pixels = (context->pixbuf->pixels +
-                         context->pixbuf->rowstride *
+                         (gsize) context->pixbuf->rowstride *
                          (context->Lines-context->Header.height));
        while (X < context->Header.width) {
                int Bit;
@@ -1040,7 +1042,7 @@ fill_entry (IconEntry *icon,
        pixels = gdk_pixbuf_get_pixels (pixbuf);
        n_channels = gdk_pixbuf_get_n_channels (pixbuf);
        for (y = 0; y < icon->height; y++) {
-               p = pixels + gdk_pixbuf_get_rowstride (pixbuf) * (icon->height - 1 - y);
+               p = pixels + (gsize) gdk_pixbuf_get_rowstride (pixbuf) * (icon->height - 1 - y);
                and = icon->and + icon->and_rowstride * y;
                xor = icon->xor + icon->xor_rowstride * y;
                for (x = 0; x < icon->width; x++) {