linux-hardening - [PATCH] pstore/ram: Replace of_node_put with _

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Date: Mon, 15 Apr 2024 16:14:09 +0000
From: Abhinav Jain <jain.abhinav177@...il.com>
To: keescook@...omium.org,
	tony.luck@...el.com,
	gpiccoli@...lia.com,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: skhan@...uxfoundation.org,
	javier.carrasco.cruz@...il.com,
	Abhinav Jain <jain.abhinav177@...il.com>,
	Julia Lawall <julia.lawall@...ia.fr>
Subject: [PATCH] pstore/ram: Replace of_node_put with __free() for automatic cleanup

Add __free(device_node) to the parent_node struct declaration.
Move declaration to initialization for ensuring scope sanity.
Remove of_node_put from parent_node struct.

Suggested-by: Julia Lawall <julia.lawall@...ia.fr>
Signed-off-by: Abhinav Jain <jain.abhinav177@...il.com>
---
 fs/pstore/ram.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index b1a455f42e93..14f2f4864e48 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -644,7 +644,6 @@ static int ramoops_parse_dt(struct platform_device *pdev,
 			    struct ramoops_platform_data *pdata)
 {
 	struct device_node *of_node = pdev->dev.of_node;
-	struct device_node *parent_node;
 	struct resource *res;
 	u32 value;
 	int ret;
@@ -704,14 +703,13 @@ static int ramoops_parse_dt(struct platform_device *pdev,
 	 * we're not a child of "reserved-memory" and mimicking the
 	 * expected behavior.
 	 */
-	parent_node = of_get_parent(of_node);
+	struct device_node *parent_node __free(device_node) = of_node_parent(of_node);
 	if (!of_node_name_eq(parent_node, "reserved-memory") &&
 	    !pdata->console_size && !pdata->ftrace_size &&
 	    !pdata->pmsg_size && !pdata->ecc_info.ecc_size) {
 		pdata->console_size = pdata->record_size;
 		pdata->pmsg_size = pdata->record_size;
 	}
-	of_node_put(parent_node);
 
 	return 0;
 }
-- 
2.34.1