CVE-2024-57927

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nfs: Fix oops in nfs_netfs_init_request() when copying to cache<br /> <br /> When netfslib wants to copy some data that has just been read on behalf of<br /> nfs, it creates a new write request and calls nfs_netfs_init_request() to<br /> initialise it, but with a NULL file pointer. This causes<br /> nfs_file_open_context() to oops - however, we don&amp;#39;t actually need the nfs<br /> context as we&amp;#39;re only going to write to the cache.<br /> <br /> Fix this by just returning if we aren&amp;#39;t given a file pointer and emit a<br /> warning if the request was for something other than copy-to-cache.<br /> <br /> Further, fix nfs_netfs_free_request() so that it doesn&amp;#39;t try to free the<br /> context if the pointer is NULL.