Fix Savannah bug #31310.

* src/truetype/ttgxvar.c (ft_var_readpackedpoints): Protect against
invalid `runcnt' values.

ChangeLog

@@ -1,3 +1,10 @@
+2010-10-12  Werner Lemberg  <wl@gnu.org>
+
+	Fix Savannah bug #31310.
+
+	* src/truetype/ttgxvar.c (ft_var_readpackedpoints): Protect against
+	invalid `runcnt' values.
+
 2010-10-08  Chris Liddell  <chris.liddell@artifex.com>
 
 	Fix Savannah bug #31275.

src/truetype/ttgxvar.c

@@ -130,7 +130,7 @@
     FT_Int     j;
     FT_Int     first;
     FT_Memory  memory = stream->memory;
-    FT_Error   error = TT_Err_Ok;
+    FT_Error   error  = TT_Err_Ok;
 
     FT_UNUSED( error );
 
@@ -154,7 +154,7 @@
         runcnt = runcnt & GX_PT_POINT_RUN_COUNT_MASK;
         first  = points[i++] = FT_GET_USHORT();
 
-        if ( runcnt < 1 )
+        if ( runcnt < 1 || i + runcnt >= n )
           goto Exit;
 
         /* first point not included in runcount */
@@ -165,7 +165,7 @@
       {
         first = points[i++] = FT_GET_BYTE();
 
-        if ( runcnt < 1 )
+        if ( runcnt < 1 || i + runcnt >= n )
           goto Exit;
 
         for ( j = 0; j < runcnt; ++j )