tty: ttybuffer: Fix the softlockup issue in flushto_ldisc
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 v4.4.293 by commit 0380f643f3a7a61b0845cdc738959c2ad5735d61. For more details please see the references link.