tty: Fix out-of-bound vmalloc access in imageblit
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 v4.14.249 by commit 067c694d06040db6f0c65281bb358452ca6d85b9. For more details please see the references link.