[PATCH 1/2] clk: s2mps11: Fix possible NULL pointer dereference

[PATCH 1/2] clk: s2mps11: Fix possible NULL pointer dereference

[Krzysztof Kozlowski]

If parent device does not have of_node set the s2mps11_clk_parse_dt()
returned NULL. This NULL was later passed to of_clk_add_provider() which
dereferenced it in pr_debug() call.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: <stable@vger.kernel.org>
---
 drivers/clk/clk-s2mps11.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c
index 00a3abe103a5..27c83e45eaed 100644
--- a/drivers/clk/clk-s2mps11.c
+++ b/drivers/clk/clk-s2mps11.c
@@ -130,7 +130,7 @@ static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev)
 	int i;
 
 	if (!iodev->dev->of_node)
-		return NULL;
+		return ERR_PTR(-EINVAL);
 
 	clk_np = of_find_node_by_name(iodev->dev->of_node, "clocks");
 	if (!clk_np) {
-- 
1.7.9.5

[PATCH 2/2] clk: s2mps11: Use of_get_child_by_name

[Krzysztof Kozlowski]

of_find_node_by_name() walks over all nodes and can thus walk outside of
the parent node. Use of_get_child_by_name() instead.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
 drivers/clk/clk-s2mps11.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c
index 27c83e45eaed..6de6a970c086 100644
--- a/drivers/clk/clk-s2mps11.c
+++ b/drivers/clk/clk-s2mps11.c
@@ -132,7 +132,7 @@ static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev)
 	if (!iodev->dev->of_node)
 		return ERR_PTR(-EINVAL);
 
-	clk_np = of_find_node_by_name(iodev->dev->of_node, "clocks");
+	clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
 	if (!clk_np) {
 		dev_err(&pdev->dev, "could not find clock sub-node\n");
 		return ERR_PTR(-EINVAL);
-- 
1.7.9.5

[PATCH 1/2] clk: s2mps11: Fix possible NULL pointer dereference

[Mike Turquette]

Quoting Krzysztof Kozlowski (2014-03-21 05:18:17)
> If parent device does not have of_node set the s2mps11_clk_parse_dt()
> returned NULL. This NULL was later passed to of_clk_add_provider() which
> dereferenced it in pr_debug() call.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

I've taken both of these patches into clk-next.

Thanks!
Mike

> Cc: <stable@vger.kernel.org>
> ---
>  drivers/clk/clk-s2mps11.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c
> index 00a3abe103a5..27c83e45eaed 100644
> --- a/drivers/clk/clk-s2mps11.c
> +++ b/drivers/clk/clk-s2mps11.c
> @@ -130,7 +130,7 @@ static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev)
>         int i;
>  
>         if (!iodev->dev->of_node)
> -               return NULL;
> +               return ERR_PTR(-EINVAL);
>  
>         clk_np = of_find_node_by_name(iodev->dev->of_node, "clocks");
>         if (!clk_np) {
> -- 
> 1.7.9.5
>