linux-kernel - [tip:irq/core] irqchip/sunxi-nmi: Fix error check of of_io_request_and

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Date:	Thu, 10 Mar 2016 07:06:34 -0800
From:	tip-bot for Vladimir Zapolskiy <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, tglx@...utronix.de, jason@...edaemon.net,
	linux-kernel@...r.kernel.org, mingo@...nel.org, wens@...e.org,
	vz@...ia.com, marc.zyngier@....com,
	maxime.ripard@...e-electrons.com
Subject: [tip:irq/core] irqchip/sunxi-nmi: Fix error check of
 of_io_request_and_map()

Commit-ID:  cfe199afefe6201e998ddc07102fc1fdb55f196c
Gitweb:     http://git.kernel.org/tip/cfe199afefe6201e998ddc07102fc1fdb55f196c
Author:     Vladimir Zapolskiy <vz@...ia.com>
AuthorDate: Wed, 9 Mar 2016 03:21:29 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 10 Mar 2016 16:03:30 +0100

irqchip/sunxi-nmi: Fix error check of of_io_request_and_map()

The of_io_request_and_map() returns a valid pointer in iomem region or
ERR_PTR(), check for NULL always fails and may cause a NULL pointer
dereference on error path.

Fixes: 0e841b04c829 ("irqchip/sunxi-nmi: Switch to of_io_request_and_map() from of_iomap()")
Signed-off-by: Vladimir Zapolskiy <vz@...ia.com>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Chen-Yu Tsai <wens@...e.org>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/1457486489-10189-1-git-send-email-vz@mleia.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/irqchip/irq-sunxi-nmi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-sunxi-nmi.c b/drivers/irqchip/irq-sunxi-nmi.c
index 0820f67..668730c 100644
--- a/drivers/irqchip/irq-sunxi-nmi.c
+++ b/drivers/irqchip/irq-sunxi-nmi.c
@@ -160,9 +160,9 @@ static int __init sunxi_sc_nmi_irq_init(struct device_node *node,
 
 	gc = irq_get_domain_generic_chip(domain, 0);
 	gc->reg_base = of_io_request_and_map(node, 0, of_node_full_name(node));
-	if (!gc->reg_base) {
+	if (IS_ERR(gc->reg_base)) {
 		pr_err("unable to map resource\n");
-		ret = -ENOMEM;
+		ret = PTR_ERR(gc->reg_base);
 		goto fail_irqd_remove;
 	}