Patch "irqchip/sunxi-nmi: Fix error check of of_io_request_and_map()" has been added to the 4.4-stable tree

Patch "irqchip/sunxi-nmi: Fix error check of of_io_request_and_map()" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     irqchip-sunxi-nmi-fix-error-check-of-of_io_request_and_map.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cfe199afefe6201e998ddc07102fc1fdb55f196c Mon Sep 17 00:00:00 2001
From: Vladimir Zapolskiy <vz@mleia.com>
Date: Wed, 9 Mar 2016 03:21:29 +0200
Subject: irqchip/sunxi-nmi: Fix error check of of_io_request_and_map()

From: Vladimir Zapolskiy <vz@mleia.com>

commit cfe199afefe6201e998ddc07102fc1fdb55f196c upstream.

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@mleia.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1457486489-10189-1-git-send-email-vz@mleia.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/irqchip/irq-sunxi-nmi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/irqchip/irq-sunxi-nmi.c
+++ b/drivers/irqchip/irq-sunxi-nmi.c
@@ -154,9 +154,9 @@ static int __init sunxi_sc_nmi_irq_init(
 
 	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;
 	}
 


Patches currently in stable-queue which might be from vz@mleia.com are

queue-4.4/irqchip-mxs-fix-error-check-of-of_io_request_and_map.patch
queue-4.4/pwm-brcmstb-fix-check-of-devm_ioremap_resource-return-code.patch
queue-4.4/irqchip-sunxi-nmi-fix-error-check-of-of_io_request_and_map.patch