2022-06-06 04:58:53

by Miaoqian Lin

Subject: [PATCH] remoteproc: k3-r5: Fix refcount leak in k3_r5_cluster_of_init

Every iteration of for_each_available_child_of_node() decrements
the reference count of the previous node.
When breaking early from a for_each_available_child_of_node() loop,
we need to explicitly call of_node_put() on the child node.
Add missing of_node_put() to avoid refcount leak.

Fixes: 6dedbd1d5443 ("remoteproc: k3-r5: Add a remoteproc driver for R5F subsystem")
Signed-off-by: Miaoqian Lin <[email protected]>
---
drivers/remoteproc/ti_k3_r5_remoteproc.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/remoteproc/ti_k3_r5_remoteproc.c b/drivers/remoteproc/ti_k3_r5_remoteproc.c
index 4840ad906018..0481926c6975 100644
--- a/drivers/remoteproc/ti_k3_r5_remoteproc.c
+++ b/drivers/remoteproc/ti_k3_r5_remoteproc.c
@@ -1655,6 +1655,7 @@ static int k3_r5_cluster_of_init(struct platform_device *pdev)
if (!cpdev) {
ret = -ENODEV;
dev_err(dev, "could not get R5 core platform device\n");
+ of_node_put(child);
goto fail;
}

@@ -1663,6 +1664,7 @@ static int k3_r5_cluster_of_init(struct platform_device *pdev)
dev_err(dev, "k3_r5_core_of_init failed, ret = %d\n",
ret);
put_device(&cpdev->dev);
+ of_node_put(child);
goto fail;
}

--
2.25.1

2022-06-07 10:44:29

by Suman Anna

Subject: Re: [PATCH] remoteproc: k3-r5: Fix refcount leak in k3_r5_cluster_of_init

Hi Miaoqian,

On 6/5/22 03:33, Miaoqian Lin wrote:
> Every iteration of for_each_available_child_of_node() decrements
> the reference count of the previous node.
> When breaking early from a for_each_available_child_of_node() loop,
> we need to explicitly call of_node_put() on the child node.
> Add missing of_node_put() to avoid refcount leak.

Thanks for catching this.

>
> Fixes: 6dedbd1d5443 ("remoteproc: k3-r5: Add a remoteproc driver for R5F subsystem")
> Signed-off-by: Miaoqian Lin <[email protected]>

Acked-by: Suman Anna <[email protected]>

regards
Suman

> ---
> drivers/remoteproc/ti_k3_r5_remoteproc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/remoteproc/ti_k3_r5_remoteproc.c b/drivers/remoteproc/ti_k3_r5_remoteproc.c
> index 4840ad906018..0481926c6975 100644
> --- a/drivers/remoteproc/ti_k3_r5_remoteproc.c
> +++ b/drivers/remoteproc/ti_k3_r5_remoteproc.c
> @@ -1655,6 +1655,7 @@ static int k3_r5_cluster_of_init(struct platform_device *pdev)
> if (!cpdev) {
> ret = -ENODEV;
> dev_err(dev, "could not get R5 core platform device\n");
> + of_node_put(child);
> goto fail;
> }
>
> @@ -1663,6 +1664,7 @@ static int k3_r5_cluster_of_init(struct platform_device *pdev)
> dev_err(dev, "k3_r5_core_of_init failed, ret = %d\n",
> ret);
> put_device(&cpdev->dev);
> + of_node_put(child);
> goto fail;
> }
>

2022-06-14 23:13:16

by Mathieu Poirier

Subject: Re: [PATCH] remoteproc: k3-r5: Fix refcount leak in k3_r5_cluster_of_init

On Sun, Jun 05, 2022 at 12:33:34PM +0400, Miaoqian Lin wrote:
> Every iteration of for_each_available_child_of_node() decrements
> the reference count of the previous node.
> When breaking early from a for_each_available_child_of_node() loop,
> we need to explicitly call of_node_put() on the child node.
> Add missing of_node_put() to avoid refcount leak.
>
> Fixes: 6dedbd1d5443 ("remoteproc: k3-r5: Add a remoteproc driver for R5F subsystem")
> Signed-off-by: Miaoqian Lin <[email protected]>
> ---
> drivers/remoteproc/ti_k3_r5_remoteproc.c | 2 ++
> 1 file changed, 2 insertions(+)

I have applied this patch.

Thanks,
Mathieu

>
> diff --git a/drivers/remoteproc/ti_k3_r5_remoteproc.c b/drivers/remoteproc/ti_k3_r5_remoteproc.c
> index 4840ad906018..0481926c6975 100644
> --- a/drivers/remoteproc/ti_k3_r5_remoteproc.c
> +++ b/drivers/remoteproc/ti_k3_r5_remoteproc.c
> @@ -1655,6 +1655,7 @@ static int k3_r5_cluster_of_init(struct platform_device *pdev)
> if (!cpdev) {
> ret = -ENODEV;
> dev_err(dev, "could not get R5 core platform device\n");
> + of_node_put(child);
> goto fail;
> }
>
> @@ -1663,6 +1664,7 @@ static int k3_r5_cluster_of_init(struct platform_device *pdev)
> dev_err(dev, "k3_r5_core_of_init failed, ret = %d\n",
> ret);
> put_device(&cpdev->dev);
> + of_node_put(child);
> goto fail;
> }
>
> --
> 2.25.1
>