linux-kernel - [PATCH -next] irqchip/tango: Fix potential NULL pointer dereference

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Message-ID: <20190129080122.20392-1-yuehaibing@huawei.com>
Date:   Tue, 29 Jan 2019 16:01:22 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <tglx@...utronix.de>, <jason@...edaemon.net>,
        <marc.zyngier@....com>, <marc.w.gonzalez@...e.fr>, <mans@...sr.com>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH -next] irqchip/tango: Fix potential NULL pointer dereference

There is a potential NULL pointer dereference in case kzalloc()
fails and returns NULL.

Fixes: 4bba66899ac6 ("irqchip/tango: Add support for Sigma Designs SMP86xx/SMP87xx interrupt controller")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/irqchip/irq-tango.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-tango.c b/drivers/irqchip/irq-tango.c
index ae28d86..a63b828 100644
--- a/drivers/irqchip/irq-tango.c
+++ b/drivers/irqchip/irq-tango.c
@@ -191,6 +191,8 @@ static int __init tangox_irq_init(void __iomem *base, struct resource *baseres,
 		panic("%pOFn: failed to get address", node);
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
 	chip->ctl = res.start - baseres->start;
 	chip->base = base;
 
-- 
2.7.0