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Change History

In the Linux kernel, the following vulnerability has been resolved:

drm/amd: Fix NULL pointer dereference in device cleanup

When GPU initialization fails due to an unsupported HW block
IP blocks may have a NULL version pointer. During cleanup in
amdgpu_device_fini_hw, the code calls amdgpu_device_set_pg_state and
amdgpu_device_set_cg_state which iterate over all IP blocks and access
adev->ip_blocks[i].version without NULL checks, leading to a kernel
NULL pointer dereference.

Add NULL checks for adev->ip_blocks[i].version in both
amdgpu_device_set_cg_state and amdgpu_device_set_pg_state to prevent
dereferencing NULL pointers during GPU teardown when initialization has
failed.

(cherry picked from commit b7ac77468cda92eecae560b05f62f997a12fe2f2)

https://git.kernel.org/stable/c/062ea905fff7756b2e87143ffccaece5cdb44267

https://git.kernel.org/stable/c/43025c941aced9a9009f9ff20eea4eb78c61deb8

https://git.kernel.org/stable/c/767cd24d3c4ae847688877def4891943f6611ecd