From: Arvind Yadav <arvind.yadav.cs@gmail.com>
Date: Mon, 12 Dec 2016 17:43:27 +0000 (+0530)
Subject: ata: sata_mv:- Handle return value of devm_ioremap.
X-Git-Tag: v4.4.48~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=579a917538f145b96c7982c1d9f54181434959fe;p=profile%2Fcommon%2Fplatform%2Fkernel%2Flinux-artik7.git

ata: sata_mv:- Handle return value of devm_ioremap.

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>
---

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index bd74ee5..729f263 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -4121,6 +4121,9 @@ static int mv_platform_probe(struct platform_device *pdev)
 	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);