CVE-2024-41008

/// Technical description

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

drm/amdgpu: change vm->task_info handling

This patch changes the handling and lifecycle of vm->task_info object.

The major changes are:

- vm->task_info is a dynamically allocated ptr now, and its uasge is

reference counted.

- introducing two new helper funcs for task_info lifecycle management

- amdgpu_vm_get_task_info: reference counts up task_info before

returning this info

- amdgpu_vm_put_task_info: reference counts down task_info

- last put to task_info() frees task_info from the vm.

This patch also does logistical changes required for existing usage

of vm->task_info.

V2: Do not block all the prints when task_info not found (Felix)

V3: Fixed review comments from Felix

- Fix wrong indentation

- No debug message for -ENOMEM

- Add NULL check for task_info

- Do not duplicate the debug messages (ti vs no ti)

- Get first reference of task_info in vm_init(), put last

in vm_fini()

V

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References