[PATCH 5.15 078/106] irqchip/realtek-rtl: Fix refcount leak in map_interrupts

Greg Kroah-Hartman
2022-06-20T13:27:45Z

From: Miaoqian Lin <linmq006@gmail.com>

[ Upstream commit eff4780f83d0ae3e5b6c02ff5d999dc4c1c5c8ce ]

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@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220601080930.31005-7-linmq006@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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)
--
2.35.1