Description
In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-framebuffer: Use dma_buf from GEM object instance" This reverts commit cce16fcd7446dcff7480cd9d2b6417075ed81065. The dma_buf field in struct drm_gem_object is not stable over the object instance's lifetime. The field becomes NULL when user space releases the final GEM handle on the buffer object. This resulted in a NULL-pointer deref. Workarounds in commit 5307dce878d4 ("drm/gem: Acquire references on GEM handles for framebuffers") and commit f6bfc9afc751 ("drm/framebuffer: Acquire internal references on GEM handles") only solved the problem partially. They especially don't work for buffer objects without a DRM framebuffer associated. Hence, this revert to going back to using .import_attach->dmabuf. v3: - cc stable
Product status
cce16fcd7446dcff7480cd9d2b6417075ed81065 before e31f5a1c2cd38bf977736cdfa79444e19d4005ec
cce16fcd7446dcff7480cd9d2b6417075ed81065 before 2712ca878b688682ac2ce02aefc413fc76019cd9
6.15
Any version before 6.15
6.15.9
6.16
References
git.kernel.org/...c/e31f5a1c2cd38bf977736cdfa79444e19d4005ec
git.kernel.org/...c/2712ca878b688682ac2ce02aefc413fc76019cd9
