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

[<gregkh@linuxfoundation.org>]

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

    irqchip/mxs: 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-mxs-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 edf8fcdc6b254236be005851af35ea5e826e7e09 Mon Sep 17 00:00:00 2001
From: Vladimir Zapolskiy <vz@mleia.com>
Date: Wed, 9 Mar 2016 03:21:40 +0200
Subject: irqchip/mxs: Fix error check of of_io_request_and_map()

From: Vladimir Zapolskiy <vz@mleia.com>

commit edf8fcdc6b254236be005851af35ea5e826e7e09 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: 25e34b44313b ("irqchip/mxs: Prepare driver for hardware with different offsets")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Oleksij Rempel <linux@rempel-privat.de>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1457486500-10237-1-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-mxs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/irqchip/irq-mxs.c
+++ b/drivers/irqchip/irq-mxs.c
@@ -183,7 +183,7 @@ static void __iomem * __init icoll_init_
 	void __iomem *icoll_base;
 
 	icoll_base = of_io_request_and_map(np, 0, np->name);
-	if (!icoll_base)
+	if (IS_ERR(icoll_base))
 		panic("%s: unable to map resource", np->full_name);
 	return icoll_base;
 }


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