CVE-2025-38669 Revert "drm/gem-shmem: Use dma_buf from GEM object instance"

In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-shmem: Use dmabuf from GEM object instance" This reverts commit 1a148af06000e545e714fe3210af3d77ff903c11. The dmabuf field in struct drmgemobject is not stable over the object instance's lifetime. The field become...