Linux Kernel NULL Pointer Dereference Vulnerability in AMD GPU Device Cleanup

A NULL pointer dereference vulnerability has been addressed in the Linux kernel's AMD GPU driver. This issue occurs when GPU initialization fails due to an unsupported hardware block, leaving IP blocks with a NULL version pointer. During the cleanup process, the code improperly accesses these NULL pointers without checks, leading to a kernel crash. The vulnerability has been fixed by adding necessary NULL checks before accessing the version pointers, preventing the dereference of NULL values during GPU teardown after a failed initialization.

Impact

Exploitation of this vulnerability leads to a kernel NULL pointer dereference, causing a system crash.