Olivier Fourdan 57a446c0f9 os: Fix NULL pointer dereference ...

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>

2024-09-23 09:36:52 +02:00

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