linux-kernel - [RFT PATCH] serial: amba-pl011: Fix devm_ioremap

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Message-Id: <1436448101-24819-1-git-send-email-k.kozlowski.k@gmail.com>
Date:	Thu,  9 Jul 2015 22:21:41 +0900
From:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>
To:	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>,
	<stable@...r.kernel.org>
Subject: [RFT PATCH] serial: amba-pl011: Fix devm_ioremap_resource return value check

Value returned by devm_ioremap_resource() was checked for non-NULL but
devm_ioremap_resource() returns IOMEM_ERR_PTR, not NULL. In case of
error this could lead to dereference of ERR_PTR.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@...il.com>
Cc: <stable@...r.kernel.org>
Fixes: 3873e2d7f63a ("drivers: PL011: refactor pl011_probe()")

---

Patch only compile tested.
---
 drivers/tty/serial/amba-pl011.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 50cf5b10ceed..fd27e986b1dd 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2310,8 +2310,8 @@ static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap,
 	void __iomem *base;
 
 	base = devm_ioremap_resource(dev, mmiobase);
-	if (!base)
-		return -ENOMEM;
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	index = pl011_probe_dt_alias(index, dev);
 
-- 
2.1.4

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