linux-kernel - [PATCH] irqchip: Fix refcount leak in platform_irqchip

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230102121318.3990586-1-linmq006@gmail.com>
Date:   Mon,  2 Jan 2023 16:13:18 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] irqchip: Fix refcount leak in platform_irqchip_probe

of_irq_find_parent() returns a node pointer with refcount incremented,
We should use of_node_put() on it when not needed anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: f8410e626569 ("irqchip: Add IRQCHIP_PLATFORM_DRIVER_BEGIN/END and IRQCHIP_MATCH helper macros")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/irqchip/irqchip.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c
index 3570f0a588c4..7899607fbee8 100644
--- a/drivers/irqchip/irqchip.c
+++ b/drivers/irqchip/irqchip.c
@@ -38,8 +38,10 @@ int platform_irqchip_probe(struct platform_device *pdev)
 	struct device_node *par_np = of_irq_find_parent(np);
 	of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
 
-	if (!irq_init_cb)
+	if (!irq_init_cb) {
+		of_node_put(par_np);
 		return -EINVAL;
+	}
 
 	if (par_np == np)
 		par_np = NULL;
@@ -52,8 +54,10 @@ int platform_irqchip_probe(struct platform_device *pdev)
 	 * interrupt controller. The actual initialization callback of this
 	 * interrupt controller can check for specific domains as necessary.
 	 */
-	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY))
+	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY)) {
+		of_node_put(par_np);
 		return -EPROBE_DEFER;
+	}
 
 	return irq_init_cb(np, par_np);
 }
-- 
2.25.1