linux-kernel - [irqchip: irq/irqchip-fixes] irqchip/realtek-rtl: Fix refcount leak in map

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Date:   Thu, 09 Jun 2022 16:50:24 -0000
From:   "irqchip-bot for Miaoqian Lin" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Miaoqian Lin <linmq006@...il.com>, Marc Zyngier <maz@...nel.org>,
        tglx@...utronix.de
Subject: [irqchip: irq/irqchip-fixes] irqchip/realtek-rtl: Fix refcount leak
 in map_interrupts

The following commit has been merged into the irq/irqchip-fixes branch of irqchip:

Commit-ID:     eff4780f83d0ae3e5b6c02ff5d999dc4c1c5c8ce
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/eff4780f83d0ae3e5b6c02ff5d999dc4c1c5c8ce
Author:        Miaoqian Lin <linmq006@...il.com>
AuthorDate:    Wed, 01 Jun 2022 12:09:30 +04:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Thu, 09 Jun 2022 17:36:57 +01:00

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>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20220601080930.31005-7-linmq006@gmail.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 50a5682..56bf502 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)