linux-kernel - [irqchip: irq/irqchip-next] irqchip/loongson-pch-pic: Fix translate callback for DT path

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Date:   Sat, 26 Nov 2022 13:34:43 -0000
From:   "irqchip-bot for Jianmin Lv" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Jianmin Lv <lvjianmin@...ngson.cn>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] irqchip/loongson-pch-pic: Fix translate
 callback for DT path

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

Commit-ID:     c7c00138015975c8f0e268564249cc47d8de632c
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/c7c00138015975c8f0e268564249cc47d8de632c
Author:        Jianmin Lv <lvjianmin@...ngson.cn>
AuthorDate:    Sat, 22 Oct 2022 15:59:53 +08:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Sat, 26 Nov 2022 13:05:38 

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>
Reviewed-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20221022075955.11726-3-lvjianmin@loongson.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 c01b9c2..03493cd 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 {