[gnumeric] Fixed an array access issue.

[Jean BrÃfort <jbrefort src gnome org>]

commit 946aae001e13b7de9c885c41f21817d607728fd1
Author: Jean Brefort <jean brefort normalesup org>
Date:   Sun Mar 18 11:15:55 2012 +0100

    Fixed an array access issue.

 ChangeLog   |    5 +++++
 src/graph.c |    3 ++-
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 68e1acc..e12dc59 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-03-18  Jean Brefort  <jean brefort normalesup org>
+
+	* src/graph.c (gnm_go_data_vector_get_markup): don't access an array with
+	an index larger than the size.
+
 2012-03-14  Morten Welinder  <terra gnome org>
 
 	* src/cell.h (struct _GnmCell): remove row_info pointers.  All
diff --git a/src/graph.c b/src/graph.c
index f421222..fda7032 100644
--- a/src/graph.c
+++ b/src/graph.c
@@ -911,7 +911,8 @@ gnm_go_data_vector_get_markup (GODataVector *dat, unsigned i)
 		}
 	}
 
-	return pango_attr_list_copy (g_ptr_array_index (vec->markup, i));
+	return pango_attr_list_copy ((vec->markup->len > i)?
+	                             g_ptr_array_index (vec->markup, i): NULL);
 }
 
 static void