Linux Kernel DLM NULL Pointer Dereference Vulnerability

A vulnerability in the Linux kernel's Distributed Lock Manager (DLM) can lead to a NULL pointer dereference. This issue arises when a positive value is written to 'event_done', which is then incorrectly treated as a success. As a result, a NULL lockspace is passed to 'dlm_find_lockspace_local', causing a NULL pointer dereference. This vulnerability has been present for a significant time, making it unlikely to disrupt user space expectations.

Impact

Exploitation of this vulnerability causes a NULL pointer dereference, leading to a crash of the affected system or application.