[PATCH] clk: versatile: Add of_node_put() before return statement

[PATCH] clk: versatile: Add of_node_put() before return statement

[Sumera Priyadarsini]

Every iteration of for_each_available_child_of_node() decrements
the reference count of the previous node, however when control is
transferred from the middle of the loop, as in the case of a return
or break or goto, there is no decrement thus ultimately resulting in
a memory leak.

Fix a potential memory leak in clk-impd1.c by inserting
of_node_put() before a return statement.

Issue found with Coccinelle.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
---
 drivers/clk/versatile/clk-impd1.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/versatile/clk-impd1.c b/drivers/clk/versatile/clk-impd1.c
index ca798249544d..85c395df9c00 100644
--- a/drivers/clk/versatile/clk-impd1.c
+++ b/drivers/clk/versatile/clk-impd1.c
@@ -109,8 +109,10 @@ static int integrator_impd1_clk_probe(struct platform_device *pdev)
 
 	for_each_available_child_of_node(np, child) {
 		ret = integrator_impd1_clk_spawn(dev, np, child);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			break;
+		}
 	}
 
 	return ret;
-- 
2.17.1

Re: [PATCH] clk: versatile: Add of_node_put() before return statement

[Linus Walleij]

On Sat, Aug 29, 2020 at 7:57 PM Sumera Priyadarsini
<sylphrenadin@gmail.com> wrote:

> Every iteration of for_each_available_child_of_node() decrements
> the reference count of the previous node, however when control is
> transferred from the middle of the loop, as in the case of a return
> or break or goto, there is no decrement thus ultimately resulting in
> a memory leak.
>
> Fix a potential memory leak in clk-impd1.c by inserting
> of_node_put() before a return statement.
>
> Issue found with Coccinelle.
>
> Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

Re: [PATCH] clk: versatile: Add of_node_put() before return statement

[Stephen Boyd]

Quoting Sumera Priyadarsini (2020-08-29 10:57:04)
> Every iteration of for_each_available_child_of_node() decrements
> the reference count of the previous node, however when control is
> transferred from the middle of the loop, as in the case of a return
> or break or goto, there is no decrement thus ultimately resulting in
> a memory leak.
> 
> Fix a potential memory leak in clk-impd1.c by inserting
> of_node_put() before a return statement.
> 
> Issue found with Coccinelle.
> 
> Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
> ---

Applied to clk-fixes