um: Fix out-of-bounds read in LDT setup
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 v4.9.318 by commit 668ca34a428d6ffc0f99a1a6a9b661a288d4183b, it was introduced in version v2.6.15 by commit 858259cf7d1c443c836a2022b78cb281f0a9b95e. For more details please see the references link.