471650430b
Add a regression test that reproduces the SyncChangeCounter use-after-free. The test creates a counter (value=0) and issues SyncAwait with two conditions on the same counter, both waiting for value >= 1. A second client then calls SetCounter to set the value to 100. SyncChangeCounter iterates triggers; the first fires and FreeAwait frees all sibling trigger list nodes via SyncDeleteTriggerFromSyncObject. Without the fix, the saved pnext pointer would dangle, and the next iteration would dereference freed heap memory. Assisted-by: Claude:claude-opus-4-6 Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2228> |
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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: