CVE-2023-53095

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/ttm: Fix a NULL pointer dereference<br /> <br /> The LRU mechanism may look up a resource in the process of being removed<br /> from an object. The locking rules here are a bit unclear but it looks<br /> currently like res-&gt;bo assignment is protected by the LRU lock, whereas<br /> bo-&gt;resource is protected by the object lock, while *clearing* of<br /> bo-&gt;resource is also protected by the LRU lock. This means that if<br /> we check that bo-&gt;resource points to the LRU resource under the LRU<br /> lock we should be safe.<br /> So perform that check before deciding to swap out a bo. That avoids<br /> dereferencing a NULL bo-&gt;resource in ttm_bo_swapout().