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Created attachment 426141 [details]
dga crash test

Description of problem:
A DGA client registering for pointer events can crash the server if the device moved is a floating slave device.

Version-Release number of selected component (if applicable):
xorg-x11-server-1.7.7-11.el6

How reproducible:
If a floating slave generates pointer events while a DGA client has selected for input, a null-pointer dereference causes a server crash.

Steps to Reproduce:
1. find the name of a pointer device on your machine (xinput --list)
2. float the device (xinput --float <device name>)
3. compile and run the attached dga.c test program.
4. Move the device, server crashes.
  
Additional info:
Some pointer devices have keys attached to them (evtest on the device file will show this). Good devices to test are standalone USB mice (not from mouse/keyboard combos) or the trackstick found on Lenovo laptops.

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

MODIFIED

xorg-x11-server-1.7.7-16.el6 is available in brew.

following comment 0 steps:
1. xinput --float "Dell Dell USB Optical Mouse"
2. compilation and executing of dga.c (have to use -lX11 -lXxf86dga)  
3. mouse movements done

results:
no crash 

-> VERIFIED

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.