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Date: Tue, 7 Feb 2017 13:45:37 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Arvind Yadav <arvind.yadav.cs@...il.com>, Tejun Heo <tj@...nel.org> Subject: [PATCH 4.4 08/29] ata: sata_mv:- Handle return value of devm_ioremap. 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arvind Yadav <arvind.yadav.cs@...il.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@...il.com> Signed-off-by: Tejun Heo <tj@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/ata/sata_mv.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -4121,6 +4121,9 @@ 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);
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