affb27caa2
RemoveHost() can be called from DisableLocalHost() with a NULL client,
but doesn't actually check whether the given client pointer is valid on
error and assigns the error value unconditionally, leading to a possible
NULL pointer dereference and a crash of the Xserver.
To avoid the issue, simply check whether the client pointer is not NULL
prior to assign the errorValue.
Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1752
See-also: https://bugzilla.redhat.com/2313799
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1701>
(cherry picked from commit
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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: https://en.wikipedia.org/wiki/X_server
All questions regarding this software should be directed at the Xorg mailing list:
https://lists.freedesktop.org/mailman/listinfo/xorg
The primary development code repository can be found at:
https://gitlab.freedesktop.org/xorg/xserver
For patch submission instructions, see:
https://www.x.org/wiki/Development/Documentation/SubmittingPatches
As with other projects hosted on freedesktop.org, X.Org follows its Code of Conduct, based on the Contributor Covenant. Please conduct yourself in a respectful and civilized manner when using the above mailing lists, bug trackers, etc: