1.169.1. RHBA-2010:0722: bug fix update
X.org X11 is an open source implementation of the X Window System. It provides the basic low level functionality upon which full fledged graphical user interfaces such as GNOME and KDE are designed.
* the 'miDbePositionWindow' function allocates two pixmaps: a front buffer, and a back buffer. If the buffers are supposed to be initialized, it validates a graphic context (GC) against the front buffer, then uses it to fill and/or copy both the front buffer and the back buffer, without revalidating. If the acceleration architecture needed different GC functions for the two pixmaps, for example if allocation of the front buffer exhausted video memory, then this caused crashes because the GC was not validated for the back buffer pixmap. With this update, the crashes no longer occur and GC validation works as expected. ( BZ#626328
All users of xorg-x11-server are advised to upgrade to these updated packages, which resolve this issue.