linux-kernel - [PATCH 4.5 27/88] clk: bcm2835: fix check of error code returned by devm_ioremap

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Date:	Mon,  9 May 2016 09:21:16 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Vladimir Zapolskiy <vz@...ia.com>,
	Eric Anholt <eric@...olt.net>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: [PATCH 4.5 27/88] clk: bcm2835: fix check of error code returned by devm_ioremap_resource()

4.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vladimir Zapolskiy <vz@...ia.com>

commit 4d3ac6662452060721599a3392bc2f524af984cb upstream.

The change fixes potential oops while accessing iomem on invalid
address, if devm_ioremap_resource() fails due to some reason.

The devm_ioremap_resource() function returns ERR_PTR() and never
returns NULL, which makes useless a following check for NULL.

Signed-off-by: Vladimir Zapolskiy <vz@...ia.com>
Fixes: 5e63dcc74b30 ("clk: bcm2835: Add a driver for the auxiliary peripheral clock gates")
Reviewed-by: Eric Anholt <eric@...olt.net>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/clk/bcm/clk-bcm2835-aux.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/clk/bcm/clk-bcm2835-aux.c
+++ b/drivers/clk/bcm/clk-bcm2835-aux.c
@@ -38,8 +38,8 @@ static int bcm2835_aux_clk_probe(struct
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	reg = devm_ioremap_resource(dev, res);
-	if (!reg)
-		return -ENODEV;
+	if (IS_ERR(reg))
+		return PTR_ERR(reg);
 
 	onecell = devm_kmalloc(dev, sizeof(*onecell), GFP_KERNEL);
 	if (!onecell)