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ff055506f0
If the master does not have a button class, recalculating the number of buttons required for this master dereferences a NULL pointer. Guard against this, if the master pointer doesn't have a button class, it doesn't need to update it's number of buttons. Reproducible: Two devices on the same master, device NB with axes but no buttons, device A+B with axes and button . If NB was the last one to send an event through the master when A+B is removed from the server, master->button is NULL and leads to the above NULL-pointer dereference. X.Org Bug 29669 <http://bugs.freedesktop.org/show_bug.cgi?id=29669> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Keith Packard <keithp@keithp.com>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
following article:
http://en.wikipedia.org/wiki/X_server
All questions regarding this software should be directed at the
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http://lists.freedesktop.org/mailman/listinfo/xorg
Please submit bug reports to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/xserver
http://cgit.freedesktop.org/xorg/xserver
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http://www.x.org/wiki/Development/Documentation/SubmittingPatches
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