Patch "ata: sata_mv:- Handle return value of devm_ioremap." has been added to the 4.9-stable tree

Patch "ata: sata_mv:- Handle return value of devm_ioremap." has been added to the 4.9-stable tree

[gregkh]

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

    ata: sata_mv:- Handle return value of devm_ioremap.

to the 4.9-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:
     ata-sata_mv-handle-return-value-of-devm_ioremap.patch
and it can be found in the queue-4.9 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 064c3db9c564cc5be514ac21fb4aa26cc33db746 Mon Sep 17 00:00:00 2001
From: Arvind Yadav <arvind.yadav.cs@gmail.com>
Date: Mon, 12 Dec 2016 23:13:27 +0530
Subject: ata: sata_mv:- Handle return value of devm_ioremap.

From: Arvind Yadav <arvind.yadav.cs@gmail.com>

commit 064c3db9c564cc5be514ac21fb4aa26cc33db746 upstream.

Here, If devm_ioremap will fail. It will return NULL.
Then hpriv->base = NULL - 0x20000; 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>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/ata/sata_mv.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -4132,6 +4132,9 @@ static int mv_platform_probe(struct plat
 	host->iomap = NULL;
 	hpriv->base = devm_ioremap(&pdev->dev, res->start,
 				   resource_size(res));
+	if (!hpriv->base)
+		return -ENOMEM;
+
 	hpriv->base -= SATAHC0_REG_BASE;
 
 	hpriv->clk = clk_get(&pdev->dev, NULL);


Patches currently in stable-queue which might be from arvind.yadav.cs@gmail.com are

queue-4.9/ata-sata_mv-handle-return-value-of-devm_ioremap.patch