linux-kernel - [PATCH] irqchip: fix an OF node reference 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 for Android: free password hash cracker in your pocket

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

Message-Id: <20241215033945.3414223-1-joe@pf.is.s.u-tokyo.ac.jp>
Date: Sun, 15 Dec 2024 12:39:45 +0900
From: Joe Hattori <joe@...is.s.u-tokyo.ac.jp>
To: tglx@...utronix.de
Cc: linux-kernel@...r.kernel.org,
	Joe Hattori <joe@...is.s.u-tokyo.ac.jp>
Subject: [PATCH] irqchip: fix an OF node reference leak in platform_irqchip_probe()

platform_irqchip_probe() leaks an OF node when irq_init_cb fails. Fix it
by declaring par_np with the __free(device_node) cleanup construct.

This bug was found by an experimental static analysis tool that I am
developing.

Fixes: f8410e626569 ("irqchip: Add IRQCHIP_PLATFORM_DRIVER_BEGIN/END and IRQCHIP_MATCH helper macros")
Signed-off-by: Joe Hattori <joe@...is.s.u-tokyo.ac.jp>
---
 drivers/irqchip/irqchip.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c
index 1eeb0d0156ce..0ee7b6b71f5f 100644
--- a/drivers/irqchip/irqchip.c
+++ b/drivers/irqchip/irqchip.c
@@ -35,11 +35,10 @@ void __init irqchip_init(void)
 int platform_irqchip_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	struct device_node *par_np = of_irq_find_parent(np);
+	struct device_node *par_np __free(device_node) = of_irq_find_parent(np);
 	of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
 
 	if (!irq_init_cb) {
-		of_node_put(par_np);
 		return -EINVAL;
 	}
 
@@ -55,7 +54,6 @@ int platform_irqchip_probe(struct platform_device *pdev)
 	 * interrupt controller can check for specific domains as necessary.
 	 */
 	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY)) {
-		of_node_put(par_np);
 		return -EPROBE_DEFER;
 	}
 
-- 
2.34.1