linux-kernel - [PATCH] soc: qcom: smp2p: Add of_node

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Message-Id: <20190804162502.6170-1-nishkadg.linux@gmail.com>
Date:   Sun,  4 Aug 2019 21:55:02 +0530
From:   Nishka Dasgupta <nishkadg.linux@...il.com>
To:     agross@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Nishka Dasgupta <nishkadg.linux@...il.com>
Subject: [PATCH] soc: qcom: smp2p: Add of_node_put() at goto

Each iteration of for_each_available_child_of_node puts the previous
node, but in the case of a goto from the middle of the loop, there is no
put, thus causing a memory leak. Hence make the gotos within the loop
first go to a new label where an of_node_put() puts the last used node,
before falling through to the original label.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@...il.com>
---
 drivers/soc/qcom/smp2p.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
index c7300d54e444..d223e914487d 100644
--- a/drivers/soc/qcom/smp2p.c
+++ b/drivers/soc/qcom/smp2p.c
@@ -501,7 +501,7 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
 		entry = devm_kzalloc(&pdev->dev, sizeof(*entry), GFP_KERNEL);
 		if (!entry) {
 			ret = -ENOMEM;
-			goto unwind_interfaces;
+			goto release_child;
 		}
 
 		entry->smp2p = smp2p;
@@ -509,18 +509,18 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
 
 		ret = of_property_read_string(node, "qcom,entry-name", &entry->name);
 		if (ret < 0)
-			goto unwind_interfaces;
+			goto release_child;
 
 		if (of_property_read_bool(node, "interrupt-controller")) {
 			ret = qcom_smp2p_inbound_entry(smp2p, entry, node);
 			if (ret < 0)
-				goto unwind_interfaces;
+				goto release_child;
 
 			list_add(&entry->node, &smp2p->inbound);
 		} else  {
 			ret = qcom_smp2p_outbound_entry(smp2p, entry, node);
 			if (ret < 0)
-				goto unwind_interfaces;
+				goto release_child;
 
 			list_add(&entry->node, &smp2p->outbound);
 		}
@@ -541,6 +541,8 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
 
 	return 0;
 
+release_child:
+	of_node_put(node);
 unwind_interfaces:
 	list_for_each_entry(entry, &smp2p->inbound, node)
 		irq_domain_remove(entry->domain);
-- 
2.19.1