[PATCH] meson-mx-socinfo: Fix refcount leak in meson_mx_socinfo_init

[PATCH] meson-mx-socinfo: Fix refcount leak in meson_mx_socinfo_init

[Miaoqian Lin]

of_find_matching_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: 5e68c0fc8df8 ("soc: amlogic: Add Meson6/Meson8/Meson8b/Meson8m2 SoC Information driver")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/soc/amlogic/meson-mx-socinfo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/amlogic/meson-mx-socinfo.c b/drivers/soc/amlogic/meson-mx-socinfo.c
index 78f0f1aeca57..92125dd65f33 100644
--- a/drivers/soc/amlogic/meson-mx-socinfo.c
+++ b/drivers/soc/amlogic/meson-mx-socinfo.c
@@ -126,6 +126,7 @@ static int __init meson_mx_socinfo_init(void)
 	np = of_find_matching_node(NULL, meson_mx_socinfo_analog_top_ids);
 	if (np) {
 		analog_top_regmap = syscon_node_to_regmap(np);
+		of_node_put(np);
 		if (IS_ERR(analog_top_regmap))
 			return PTR_ERR(analog_top_regmap);
 
-- 
2.25.1


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Re: [PATCH] meson-mx-socinfo: Fix refcount leak in meson_mx_socinfo_init

[Martin Blumenstingl]

On Tue, May 24, 2022 at 8:57 AM Miaoqian Lin <linmq006@gmail.com> wrote:
>
> of_find_matching_node() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when not need anymore.
> Add missing of_node_put() to avoid refcount leak.
>
> Fixes: 5e68c0fc8df8 ("soc: amlogic: Add Meson6/Meson8/Meson8b/Meson8m2 SoC Information driver")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Thank you for finding and fixing this!


Best regards,
Martin

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Re: [PATCH] meson-mx-socinfo: Fix refcount leak in meson_mx_socinfo_init

[Neil Armstrong]

Hi,

On Tue, 24 May 2022 10:57:29 +0400, Miaoqian Lin wrote:
> of_find_matching_node() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when not need anymore.
> Add missing of_node_put() to avoid refcount leak.
> 
> 

Thanks, Applied to https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git (v5.20/drivers)

[1/1] meson-mx-socinfo: Fix refcount leak in meson_mx_socinfo_init
      https://git.kernel.org/amlogic/c/a2106f38077e78afcb4bf98fdda3e162118cfb3d

These changes has been applied on the intermediate git tree [1].

The v5.20/drivers branch will then be sent via a formal Pull Request to the Linux SoC maintainers
for inclusion in their intermediate git branches in order to be sent to Linus during
the next merge window, or sooner if it's a set of fixes.

In the cases of fixes, those will be merged in the current release candidate
kernel and as soon they appear on the Linux master branch they will be
backported to the previous Stable and Long-Stable kernels [2].

The intermediate git branches are merged daily in the linux-next tree [3],
people are encouraged testing these pre-release kernels and report issues on the
relevant mailing-lists.

If problems are discovered on those changes, please submit a signed-off-by revert
patch followed by a corrective changeset.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
[3] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

-- 
Neil

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