linux-kernel - [V1] ata: sata_mv:- Handle return value of devm

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Date:   Mon, 12 Dec 2016 23:13:27 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     tj@...nel.org
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [V1] ata: sata_mv:- Handle return value of devm_ioremap.

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

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index efc48bf..9d0cdad 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -4119,6 +4119,9 @@ 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);
-- 
2.7.4