misc: fastrpc: Add missing lock before accessing find_vma()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.10.75 by commit 86e3ad8b759d1152d69442a4bb36cfa65448c9e7, it was introduced in version v5.2 by commit 80f3afd72bd4149c57daf852905476b43bb47647. For more details please see the references link.