NuytsTech Security

CVE-2024-41008

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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()

V4: Fixed review comments from Felix
– fix double reference increment in create_task_info
– change amdgpu_vm_get_task_info_pasid
– additional changes in amdgpu_gem.c while porting

More information : https://git.kernel.org/stable/c/b8f67b9ddf4f8fe6dd536590712b5912ad78f99c

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