From: Dan Carpenter <dan.carpenter@linaro.org>
Date: Tue, 9 Dec 2025 06:54:16 +0000 (+0300)
Subject: irqchip/mchp-eic: Fix error code in mchp_eic_domain_alloc()
X-Git-Tag: v6.19-rc1~6^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7dbc0d40d8347bd9de55c904f59ea44bcc8dedb7;p=thirdparty%2Fkernel%2Flinux.git

irqchip/mchp-eic: Fix error code in mchp_eic_domain_alloc()

If irq_domain_translate_twocell() sets "hwirq" to >= MCHP_EIC_NIRQ (2) then
it results in an out of bounds access.

The code checks for invalid values, but doesn't set the error code.  Return
-EINVAL in that case, instead of returning success.

Fixes: 00fa3461c86d ("irqchip/mchp-eic: Add support for the Microchip EIC")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Link: https://patch.msgid.link/aTfHmOz6IBpTIPU5@stanley.mountain
---

diff --git a/drivers/irqchip/irq-mchp-eic.c b/drivers/irqchip/irq-mchp-eic.c
index 2474fa467a059..31093a8ab67c3 100644
--- a/drivers/irqchip/irq-mchp-eic.c
+++ b/drivers/irqchip/irq-mchp-eic.c
@@ -170,7 +170,7 @@ static int mchp_eic_domain_alloc(struct irq_domain *domain, unsigned int virq,
 
 	ret = irq_domain_translate_twocell(domain, fwspec, &hwirq, &type);
 	if (ret || hwirq >= MCHP_EIC_NIRQ)
-		return ret;
+		return ret ?: -EINVAL;
 
 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING: