linux-kernel - [PATCH] irqchip/gic: Check interrupt type validity

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Date:   Wed, 23 Oct 2019 12:56:19 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     bcm-kernel-feedback-list@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Subject: [PATCH] irqchip/gic: Check interrupt type validity

In case the interrupt property specifies a type parameter that is not
GIC_SPI (0) or GIC_PPIC (1), do not attempt to translate the interrupt
and return -EINVAL instead.

Fixes: f833f57ff254 ("irqchip: Convert all alloc/xlate users from of_node to fwnode")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Marc,

Regardless of whether my attempt to use SGI moves any further, this
seems appropriate to do since we should not be trying to translate
incorrectly specified interrupts. Thanks!

 drivers/irqchip/irq-gic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 30ab623343d3..fc47e655618d 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1005,6 +1005,9 @@ static int gic_irq_domain_translate(struct irq_domain *d,
 		if (fwspec->param_count < 3)
 			return -EINVAL;
 
+		if (fwspec->param[0] > 1)
+			return -EINVAL;
+
 		/* Get the interrupt number and add 16 to skip over SGIs */
 		*hwirq = fwspec->param[1] + 16;
 
-- 
2.17.1