Fixed bug #187 - Arbitrary memory overwrite occurs when loading glyph…

…s and rendering text with a malformed TTF

Pitch/size isn't calculated with 64 bits precisions

SDL_ttf.c

@@ -1257,7 +1257,7 @@ static SDL_Surface* Create_Surface_Solid(int width, int height, SDL_Color fg, Ui
      */
     void *pixels, *ptr;
     /* Worse case at the end of line pulling 'alignment' extra blank pixels */
-    int pitch = width + alignment;
+    Sint64 pitch = width + alignment;
     pitch += alignment;
     pitch &= ~alignment;
     size = height * pitch + sizeof (void *) + alignment;
@@ -1321,7 +1321,7 @@ static SDL_Surface* Create_Surface_Shaded(int width, int height, SDL_Color fg, S
      */
     void *pixels, *ptr;
     /* Worse case at the end of line pulling 'alignment' extra blank pixels */
-    int pitch = width + alignment;
+    Sint64 pitch = width + alignment;
     pitch += alignment;
     pitch &= ~alignment;
     size = height * pitch + sizeof (void *) + alignment;
@@ -1418,7 +1418,7 @@ static SDL_Surface *Create_Surface_Blended(int width, int height, SDL_Color fg,
         Sint64 size;
         void *pixels, *ptr;
         /* Worse case at the end of line pulling 'alignment' extra blank pixels */
-        int pitch = (width + alignment) * 4;
+        Sint64 pitch = (width + alignment) * 4;
         pitch += alignment;
         pitch &= ~alignment;
         size = height * pitch + sizeof (void *) + alignment;