linux-kernel - [PATCH V4 2/4] irqchip/loongson-pch-pic: fix translate callback for DT path

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Message-Id: <20221020082205.20505-3-lvjianmin@loongson.cn>
Date:   Thu, 20 Oct 2022 16:22:03 +0800
From:   Jianmin Lv <lvjianmin@...ngson.cn>
To:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Len Brown <lenb@...nel.org>, rafael@...nel.org,
        linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: [PATCH V4 2/4] irqchip/loongson-pch-pic: fix translate callback for DT path

In DT path of translate callback, if fwspec->param_count==1
and of_node is non-null, fwspec->param[1] will be accessed,
which is introduced from previous commit bcdd75c596c8
(irqchip/loongson-pch-pic: Add ACPI init support).

Before the patch, for non-null of_node, translate callback
(use irq_domain_translate_twocell()) will return -EINVAL if
fwspec->param_count < 2, so the check in the patch is added.

Fixes: bcdd75c596c8 ("irqchip/loongson-pch-pic: Add ACPI init support")
Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
---
 drivers/irqchip/irq-loongson-pch-pic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index c01b9c257005..03493cda65a3 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -159,6 +159,9 @@ static int pch_pic_domain_translate(struct irq_domain *d,
 		return -EINVAL;
 
 	if (of_node) {
+		if (fwspec->param_count < 2)
+			return -EINVAL;
+
 		*hwirq = fwspec->param[0] + priv->ht_vec_base;
 		*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
 	} else {
-- 
2.31.1