linux-kernel - [PATCH 6/6] irqchip/realtek-rtl: Fix refcount leak in map

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Date:   Wed,  1 Jun 2022 12:09:30 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        John Crispin <john@...ozen.org>,
        Bert Vermeulen <bert@...t.com>,
        Birger Koblitz <mail@...ger-koblitz.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Miaoqian Lin <linmq006@...il.com>
Subject: [PATCH 6/6] irqchip/realtek-rtl: Fix refcount leak in map_interrupts

of_find_node_by_phandle() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
This function doesn't call of_node_put() in error path.
Call of_node_put() directly after of_property_read_u32() to cover
both normal path and error path.

Fixes: 9f3a0f34b84a ("irqchip: Add support for Realtek RTL838x/RTL839x interrupt controller")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/irqchip/irq-realtek-rtl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-realtek-rtl.c b/drivers/irqchip/irq-realtek-rtl.c
index 50a56820c99b..56bf502d9c67 100644
--- a/drivers/irqchip/irq-realtek-rtl.c
+++ b/drivers/irqchip/irq-realtek-rtl.c
@@ -134,9 +134,9 @@ static int __init map_interrupts(struct device_node *node, struct irq_domain *do
 		if (!cpu_ictl)
 			return -EINVAL;
 		ret = of_property_read_u32(cpu_ictl, "#interrupt-cells", &tmp);
+		of_node_put(cpu_ictl);
 		if (ret || tmp != 1)
 			return -EINVAL;
-		of_node_put(cpu_ictl);
 
 		cpu_int = be32_to_cpup(imap + 2);
 		if (cpu_int > 7 || cpu_int < 2)
-- 
2.25.1