| Message ID | 1609069604-3949767-1-git-send-email-bodefang@126.com |
|---|---|
| State | New |
| Headers | show |
| Series | drm/amd:avoid null pointer dereference when dev is not bound | expand |
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 37da353..f70e528 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -1439,6 +1439,9 @@ static void amdgpu_switcheroo_set_state(struct pci_dev *pdev, static bool amdgpu_switcheroo_can_switch(struct pci_dev *pdev) { struct drm_device *dev = pci_get_drvdata(pdev); + + if (!dev) + return false; /* * FIXME: open_count is protected by drm_global_mutex but that would lead to
[Why] Similar to commit<0fa375e6>. If amdgpu_switcheroo_can_switch access the drm_device when dev is not bound, a null pointer dereference can happen. [How] Add sanity checks to prevent it. Signed-off-by: Defang Bo <bodefang@126.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 +++ 1 file changed, 3 insertions(+)