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 v4.9.285 by commit 70aed03b1d5a5df974f456cdc8eedb213c94bb8b. For more details please see the references link.