linux-kernel - [PATCH 1/2] usb: chipidea: imx: fix a possible NULL dereference

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Message-Id: <1447314214-29575-1-git-send-email-clabbe.montjoie@gmail.com>
Date:	Thu, 12 Nov 2015 08:43:33 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	gregkh@...uxfoundation.org, Peter.Chen@...escale.com
Cc:	LABBE Corentin <clabbe.montjoie@...il.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH 1/2] usb: chipidea: imx: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later. Renaming tmp_dev to of_id (like all others do) in the
process.

Reported-by: coverity (CID 1324135)
Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/usb/chipidea/usbmisc_imx.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index fcea4eb..ab8b027 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -500,7 +500,11 @@ static int usbmisc_imx_probe(struct platform_device *pdev)
 {
 	struct resource	*res;
 	struct imx_usbmisc *data;
-	struct of_device_id *tmp_dev;
+	const struct of_device_id *of_id;
+
+	of_id = of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
+	if (!of_id)
+		return -ENODEV;
 
 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
@@ -513,9 +517,7 @@ static int usbmisc_imx_probe(struct platform_device *pdev)
 	if (IS_ERR(data->base))
 		return PTR_ERR(data->base);
 
-	tmp_dev = (struct of_device_id *)
-		of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
-	data->ops = (const struct usbmisc_ops *)tmp_dev->data;
+	data->ops = (const struct usbmisc_ops *)of_id->data;
 	platform_set_drvdata(pdev, data);
 
 	return 0;
-- 
2.4.10

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