CVE-2023-53552

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/i915: mark requests for GuC virtual engines to avoid use-after-free<br /> <br /> References to i915_requests may be trapped by userspace inside a<br /> sync_file or dmabuf (dma-resv) and held indefinitely across different<br /> proceses. To counter-act the memory leaks, we try to not to keep<br /> references from the request past their completion.<br /> On the other side on fence release we need to know if rq-&gt;engine<br /> is valid and points to hw engine (true for non-virtual requests).<br /> To make it possible extra bit has been added to rq-&gt;execution_mask,<br /> for marking virtual engines.<br /> <br /> (cherry picked from commit 280410677af763f3871b93e794a199cfcf6fb580)