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6862249daa
QCMake::setPreset() bound a reference to the selected preset's expanded data inside CMakePresetsGraph.ConfigurePresets and then called setBinaryDirectory(). When the selected preset's build directory holds a cache whose CMAKE_HOME_DIRECTORY differs from the current source directory (e.g. because the source path is reached through a symbolic link, since browsing keeps the link unresolved while the cache stores the real path), setBinaryDirectory() loads that cache and re-sets the source directory. That re-reads the presets graph via loadPresets(), which calls ClearPresets() and destroys the map entry, leaving the reference dangling. Subsequent access crashed with a use-after-free. Copy the expanded preset instead of holding a reference into the graph so it stays valid across setBinaryDirectory(). Fixes: #27927
