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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@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Arvind Yadav 2016-12-12 23:13:27 +05:30 committed by Tejun Heo
parent 2dae99558e
commit 064c3db9c5
1 changed files with 3 additions and 0 deletions
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3
drivers/ata/sata_mv.c
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@ -4132,6 +4132,9 @@ 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);