CVE-2025-38672 Revert "drm/gem-dma: Use dma_buf from GEM object instance"

In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-dma: Use dmabuf from GEM object instance" This reverts commit e8afa1557f4f963c9a511bd2c6074a941c308685. The dmabuf field in struct drmgemobject is not stable over the object instance's lifetime. The field becomes...