CVE-2025-40288

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Fix NULL pointer dereference in VRAM logic for APU devices

Previously, APU platforms (and other scenarios with uninitialized VRAM managers)
triggered a NULL pointer dereference in ttm_resource_manager_usage(). The root
cause is not that the struct ttm_resource_manager *man pointer itself is NULL,
but that man->bdev (the backing device pointer within the manager) remains
uninitialized (NULL) on APUs, since APUs lack dedicated VRAM and do not fully
set up VRAM manager structures. When ttm_resource_manager_usage() attempts to
acquire man->bdev->lru_lock, it dereferences the NULL man->bdev, leading to
a kernel OOPS.

1. amdgpu_cs.c: Extend the existing bandwidth control check in
   amdgpu_cs_get_threshold_for_moves() to include a check for
   ttm_resource_manager_used(). If the manager is not used (uninitialized
   bdev), return 0 for migration thresholds immediately, skipping VRAM-specific
   logic that would trigger the NULL dereference.

2. amdgpu_kms.c: Update the AMDGPU_INFO_VRAM_USAGE ioctl and memory info
   reporting to use a conditional: if the manager is used, return the real VRAM
   usage; otherwise, return 0. This avoids accessing man->bdev when it is
   NULL.

3. amdgpu_virt.c: Modify the vf2pf (virtual function to physical function)
   data write path. Use ttm_resource_manager_used() to check validity: if the
   manager is usable, calculate fb_usage from VRAM usage; otherwise, set
   fb_usage to 0 (APUs have no discrete framebuffer to report).

This approach is more robust than APU-specific checks because it:

• Works for all scenarios where the VRAM manager is uninitialized (not just APUs),
• Aligns with TTM's design by using its native helper function,
• Preserves correct behavior for discrete GPUs (which have fully initialized
  man->bdev and pass the ttm_resource_manager_used() check).

v4: use ttm_resource_manager_used(&adev->mman.vram_mgr.manager) instead of checking the adev->gmc.is_app_apu flag (Christian)