[metacity] do check of max_size in get_size_limits() to avoid overflow

[Thomas James Alexander Thurman <tthurman src gnome org>]

commit 1273850ca7457e05aee020c98ad68ca8246b228e
Author: Xu Li <xu li intel com>
Date:   Mon Aug 3 14:21:44 2009 +0800

    do check of max_size in get_size_limits() to avoid overflow

 src/core/constraints.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/src/core/constraints.c b/src/core/constraints.c
index 5606b76..c28fc0d 100644
--- a/src/core/constraints.c
+++ b/src/core/constraints.c
@@ -710,8 +710,18 @@ get_size_limits (const MetaWindow        *window,
 
       min_size->width  += fw;
       min_size->height += fh;
-      max_size->width  += fw;
-      max_size->height += fh;
+      /* Do check to avoid overflow (e.g. max_size->width & max_size->height
+       * may be set to G_MAXINT by meta_set_normal_hints()).
+       */
+      if (max_size->width < (G_MAXINT - fw))
+        max_size->width += fw;
+      else
+        max_size->width = G_MAXINT;
+
+      if (max_size->height < (G_MAXINT - fh))
+        max_size->height += fh;
+      else
+        max_size->height = G_MAXINT;
     }
 }