Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init() drmm_cgroup_register_region() is called before INIT_LIST_HEAD() and gpu_buddy_init() in amdgpu_vram_mgr_init(). If it fails, the function returns early and bypasses those initializations. Since adev->mman.initialized is set to true before amdgpu_vram_mgr_init() is called, a failure triggers amdgpu_ttm_fini(), which calls amdgpu_vram_mgr_fini(), which then: - Calls list_for_each_entry_safe() on reservations_pending and reserved_pages, whose list_head::next pointers are zero-initialized (NULL). The loop does not recognize them as empty and dereferences NULL. - Calls gpu_buddy_fini(), which iterates free_trees[] unconditionally via for_each_free_tree(). Since mm->free_trees is NULL (never allocated), this dereferences NULL. Both result in a kernel panic on the module load error path. Fix by moving drmm_cgroup_register_region() to after the list and buddy allocator are fully initialized, so the teardown path is safe to run.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2b624a2c18656ea32e0849e7bc0018ba3c97ca64 to < e184e46ca1ba652ab8053a10a51b39aad06d3f5caffected2b624a2c18656ea32e0849e7bc0018ba3c97ca64 to < 3e234c6face8651045f46895dfe9c086ea64f03baffected2b624a2c18656ea32e0849e7bc0018ba3c97ca64 to < e773798e14ac0aea54ca9676083b91f445e5bc59affected
Linux Linux
Default version status: affected
6.14affected0 to < 6.14unaffected6.18.51 to ≤ 6.18.*unaffected7.2.5 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected