net/x25: Fix null-ptr-deref caused by x25_disconnect
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 v5.4.189 by commit 9acf05b4e7b55fdb712ef7b331dbce5bcd391d0f, it was introduced in version v5.4.56 by commit 69cd304cfa5cfb0f130488af579c143382432766. For more details please see the references link.