[PATCH v1] irqchip: irq-mips-gic:- Handle return NULL error from ioremap_nocache

From	Arvind Yadav <arvind.yadav.cs@gmail.com>
Newsgroups	linux.kernel
Subject	[PATCH v1] irqchip: irq-mips-gic:- Handle return NULL error from ioremap_nocache
Date	2017-01-09 09:10 +0100
Message-ID	<sXDbH-1Ae-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Here, If ioremap_nocache will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference.
This error check will avoid NULL pointer dereference.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
 drivers/irqchip/irq-mips-gic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index c01c09e..eeea2e8 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -979,6 +979,8 @@ static void __init __gic_init(unsigned long gic_base_addr,
 	__gic_base_addr = gic_base_addr;
 
 	gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
+	if (!gic_base)
+		panic("Failed to map GIC memory");
 
 	gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
 	gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
-- 
1.9.1

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[PATCH v1] irqchip: irq-mips-gic:- Handle return NULL error from ioremap_nocache Arvind Yadav <arvind.yadav.cs@gmail.com> - 2017-01-09 09:10 +0100
  Re: [PATCH v1] irqchip: irq-mips-gic:- Handle return NULL error from  ioremap_nocache Marc Zyngier <marc.zyngier@arm.com> - 2017-01-09 10:10 +0100

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