Linux Kernel AMDGPU Driver NULL Pointer Dereference Vulnerability on Older GPUs

A vulnerability in the Linux kernel's AMDGPU driver can lead to a NULL pointer dereference on PCs with older GPUs, such as the R9 280X. This issue arises when the driver is loaded with the 'amdgpu.dc=1' option, starting from version 6.11. The problem occurs because the 'is_two_pixels_per_container' function is missing from the 'dce60_tg_funcs' structure, causing the NULL pointer dereference. The vulnerability has been addressed by adding the missing function to the appropriate structure.

Impact

Exploitation of this vulnerability causes a NULL pointer dereference, leading to a crash of the X server.