linux-kernel - [PATCH v2] arch: fix resource leak in jbusmc

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Message-ID: <tencent_2633924ADEC79A0D51ECD39670F36EC5FD09@qq.com>
Date: Mon, 21 Jul 2025 11:56:24 +0800
From: jackysliu <1972843537@...com>
To: ptikhomirov@...tuozzo.com
Cc: agk@...hat.com,
	den@...tuozzo.com,
	dm-devel@...ts.linux.dev,
	khorenko@...tuozzo.com,
	linux-kernel@...r.kernel.org,
	mpatocka@...hat.com,
	snitzer@...nel.org,
	xni@...hat.com,
	yukuai3@...wei.com,
	Siyang Liu <1972843537@...com>
Subject: [PATCH v2] arch: fix resource leak in jbusmc_probe()

From: Siyang Liu <1972843537@...com>

In the jbusmc_probe function, the device node mem_node fetched
via of_find_node_by_path("/memory") is not properly freed
on all code paths.
This can lead to leakage of device node reference counts,
which may result in kernel resources not being released.

This issue was detected by rule based static tools
developed by Tencent.

Signed-off-by: Siyang Liu <1972843537@...com>
---
 arch/sparc/kernel/chmc.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/sparc/kernel/chmc.c b/arch/sparc/kernel/chmc.c
index d4c74d6b2e1b..fd20e4ee0971 100644
--- a/arch/sparc/kernel/chmc.c
+++ b/arch/sparc/kernel/chmc.c
@@ -412,7 +412,7 @@ static int jbusmc_probe(struct platform_device *op)
 	mem_regs = of_get_property(mem_node, "reg", &len);
 	if (!mem_regs) {
 		printk(KERN_ERR PFX "Cannot get reg property of /memory node.\n");
-		goto out;
+		goto out_put;
 	}
 	num_mem_regs = len / sizeof(*mem_regs);
 
@@ -420,7 +420,7 @@ static int jbusmc_probe(struct platform_device *op)
 	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (!p) {
 		printk(KERN_ERR PFX "Cannot allocate struct jbusmc.\n");
-		goto out;
+		goto out_put;
 	}
 
 	INIT_LIST_HEAD(&p->list);
@@ -473,6 +473,10 @@ static int jbusmc_probe(struct platform_device *op)
 
 	err = 0;
 
+out_put:
+	of_node_put(mem_node);
+	goto out;
+
 out:
 	return err;
 
@@ -481,7 +485,7 @@ static int jbusmc_probe(struct platform_device *op)
 
 out_free:
 	kfree(p);
-	goto out;
+	goto out_put;
 }
 
 /* Does BANK decode PHYS_ADDR? */
-- 
2.43.5