[PATCH v3 3/6] clk: add uclass id check to clk_get_parent()

[Yang Xiwen via B4 Relay]

From: Yang Xiwen <forbidden405 at outlook.com>

Check the uclass id in clk_get_parent() before casting dev->priv to
struct clk *.  This sanity check can be also found in some other places
and should be enforced.

Reviewed-by: Simon Glass <simon.glass at canonical.com>
Signed-off-by: Yang Xiwen <forbidden405 at outlook.com>
---
 drivers/clk/clk-uclass.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index 0584429bed65..559420c85056 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -507,6 +507,10 @@ struct clk *clk_get_parent(struct clk *clk)
 	pdev = dev_get_parent(clk->dev);
 	if (!pdev)
 		return ERR_PTR(-ENODEV);
+
+	if (device_get_uclass_id(pdev) != UCLASS_CLK)
+		return ERR_PTR(-ENODEV);
+
 	pclk = dev_get_clk_ptr(pdev);
 	if (!pclk)
 		return ERR_PTR(-ENODEV);

-- 
2.43.0