linux-kernel - [PATCH] soc: qcom: ocmem: Fix refcount leak in of_get

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Date:   Thu,  2 Jun 2022 08:24:30 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Brian Masney <masneyb@...tation.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] soc: qcom: ocmem: Fix refcount leak in of_get_ocmem

of_parse_phandle() 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.
of_node_put() will check NULL pointer.

Fixes: 88c1e9404f1d ("soc: qcom: add OCMEM driver")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/soc/qcom/ocmem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/soc/qcom/ocmem.c b/drivers/soc/qcom/ocmem.c
index 97fd24c178f8..c92d26b73e6f 100644
--- a/drivers/soc/qcom/ocmem.c
+++ b/drivers/soc/qcom/ocmem.c
@@ -194,14 +194,17 @@ struct ocmem *of_get_ocmem(struct device *dev)
 	devnode = of_parse_phandle(dev->of_node, "sram", 0);
 	if (!devnode || !devnode->parent) {
 		dev_err(dev, "Cannot look up sram phandle\n");
+		of_node_put(devnode);
 		return ERR_PTR(-ENODEV);
 	}
 
 	pdev = of_find_device_by_node(devnode->parent);
 	if (!pdev) {
 		dev_err(dev, "Cannot find device node %s\n", devnode->name);
+		of_node_put(devnode);
 		return ERR_PTR(-EPROBE_DEFER);
 	}
+	of_node_put(devnode);
 
 	ocmem = platform_get_drvdata(pdev);
 	if (!ocmem) {
-- 
2.25.1