linux-kernel - [PATCH] irqchip/irq-msi-lib: Check for NULL ops in msi_lib_irq_domain

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Message-ID: <20240823100733.1900666-1-maxime.chevallier@bootlin.com>
Date: Fri, 23 Aug 2024 12:07:12 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Thomas Gleixner <tglx@...utronix.de>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...tlin.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Shivamurthy Shastri <shivamurthy.shastri@...utronix.de>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: [PATCH] irqchip/irq-msi-lib: Check for NULL ops in msi_lib_irq_domain_select

The irq_domain passed to msi_lib_irq_domain_select() may not have any
msi_parent_ops set. Move the test for NULL ops before the first use of
that pointer.

This was found on a MacchiatoBin (Marvell Armada 8K SoC), which uses the
irq-mvebu-sei driver.

Fixes: 72e257c6f058 ("irqchip: Provide irq-msi-lib")
Closes: https://lore.kernel.org/all/20240821165034.1af97bad@fedora-3.home/
Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
 drivers/irqchip/irq-msi-lib.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c
index b5b90003311a..d8e29fc0d406 100644
--- a/drivers/irqchip/irq-msi-lib.c
+++ b/drivers/irqchip/irq-msi-lib.c
@@ -128,6 +128,9 @@ int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
 	const struct msi_parent_ops *ops = d->msi_parent_ops;
 	u32 busmask = BIT(bus_token);
 
+	if (!ops)
+		return 0;
+
 	if (fwspec->fwnode != d->fwnode || fwspec->param_count != 0)
 		return 0;
 
@@ -135,6 +138,6 @@ int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
 	if (bus_token == ops->bus_select_token)
 		return 1;
 
-	return ops && !!(ops->bus_select_mask & busmask);
+	return !!(ops->bus_select_mask & busmask);
 }
 EXPORT_SYMBOL_GPL(msi_lib_irq_domain_select);
-- 
2.45.2