CVE-2025-38520 drm/amdkfd: Don't call mmput from MMU notifier callback

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Don't call mmput from MMU notifier callback If the process is exiting, the mmput inside mmu notifier callback from compactd or fork or numa balancing could release the last reference of mm struct to call exitmmap and...