linux-kernel - [PATCH] irqchip: mips-gic: check the return value of ioremap() in gic_of

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Message-Id: <20220722091008.2937238-1-williamsukatube@163.com>
Date:   Fri, 22 Jul 2022 17:10:08 +0800
From:   williamsukatube@....com
To:     tglx@...utronix.de, maz@...nel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     tsbogend@...ha.franken.de, fancer.lancer@...il.com,
        William Dean <williamsukatube@...il.com>,
        Hacash Robot <hacashRobot@...tino.com>
Subject: [PATCH] irqchip: mips-gic: check the return value of ioremap() in gic_of_init()

From: William Dean <williamsukatube@...il.com>

The function ioremap() in gic_of_init() can fail, so
its return value should be checked.

Fixes: 4bdc0d676a643 ("remove ioremap_nocache and devm_ioremap_nocache")
Reported-by: Hacash Robot <hacashRobot@...tino.com>
Signed-off-by: William Dean <williamsukatube@...il.com>
---
 drivers/irqchip/irq-mips-gic.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index ff89b36267dd..a1f6d955794a 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -734,6 +734,10 @@ static int __init gic_of_init(struct device_node *node,
 	}
 
 	mips_gic_base = ioremap(gic_base, gic_len);
+	if (!mips_gic_base) {
+		pr_err("Failed to ioremap gic_base\n");
+		return -ENOMEM;
+	}
 
 	gicconfig = read_gic_config();
 	gic_shared_intrs = FIELD_GET(GIC_CONFIG_NUMINTERRUPTS, gicconfig);
-- 
2.25.1