linux-kernel - [PATCH v3] PCI: of: Fix memory leak when of_changeset_create

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Message-ID: <1696007417-42059-1-git-send-email-lizhi.hou@amd.com>
Date:   Fri, 29 Sep 2023 10:10:17 -0700
From:   Lizhi Hou <lizhi.hou@....com>
To:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <herve.codina@...tlin.com>,
        <Jonathan.Cameron@...wei.com>
CC:     Lizhi Hou <lizhi.hou@....com>, <bhelgaas@...gle.com>,
        <robh@...nel.org>
Subject: [PATCH v3] PCI: of: Fix memory leak when of_changeset_create_node() failed

In function of_pci_make_dev_node(), the cset needs to be destroyed and
freed when of_changeset_create_node() returns null.

Fixes: 407d1a51921e ("PCI: Create device tree node for bridge")
Reported-by: Herve Codina <herve.codina@...tlin.com>
Closes: https://lore.kernel.org/all/20230911171319.495bb837@bootlin.com/
Signed-off-by: Lizhi Hou <lizhi.hou@....com>
---
 drivers/pci/of.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 2af64bcb7da3..51e3dd0ea5ab 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -657,30 +657,33 @@ void of_pci_make_dev_node(struct pci_dev *pdev)
 
 	cset = kmalloc(sizeof(*cset), GFP_KERNEL);
 	if (!cset)
-		goto failed;
+		goto out_free_name;
 	of_changeset_init(cset);
 
 	np = of_changeset_create_node(cset, ppnode, name);
 	if (!np)
-		goto failed;
-	np->data = cset;
+		goto out_destroy_cset;
 
 	ret = of_pci_add_properties(pdev, cset, np);
 	if (ret)
-		goto failed;
+		goto out_free_node;
 
 	ret = of_changeset_apply(cset);
 	if (ret)
-		goto failed;
+		goto out_free_node;
 
+	np->data = cset;
 	pdev->dev.of_node = np;
 	kfree(name);
 
 	return;
 
-failed:
-	if (np)
-		of_node_put(np);
+out_free_node:
+	of_node_put(np);
+out_destroy_cset:
+	of_changeset_destroy(cset);
+	kfree(cset);
+out_free_name:
 	kfree(name);
 }
 #endif
-- 
2.34.1