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Description of problem:
An XI 1.x grab on a disabled device leads to a NULL-pointer dereference crashing the server.

Version-Release number of selected component (if applicable):
xorg-x11-server-Xorg-1.13.0-4.el6.x86_64

How reproducible:
Can be reproduced on a virtual machine (see example below), but same will happen with other devices

Steps to Reproduce:
1. xinput set-prop "ImEXPS/2 Generic Explorer Mouse" "Device Enabled" 0
2. start gimp, Edit, Preferences, Input Devices, Configure Extended Input Devices
3. change the QEMU tablet and the ImEXPS/2 mouse to mode "screen"
4. Open a canvas, click on the canvas.
  
Actual results:
On receiving the button event, the GIMP will grab all input devices with XGrabDevice(), causing a crash.

Additional info:
https://bugs.freedesktop.org/show_bug.cgi?id=54934

This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.

MODIFIED

xorg-x11-server-1.13.0-5.el6 is available in brew

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0299.html