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

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Date:	Thu, 12 Nov 2015 08:43:34 +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 2/2] usb: chipidea: imx: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.

Reported-by: coverity (CID 1324138)
Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/usb/chipidea/ci_hdrc_imx.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 6ccbf60..a021bd5 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -145,9 +145,14 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 		.flags		= CI_HDRC_SET_NON_ZERO_TTHA,
 	};
 	int ret;
-	const struct of_device_id *of_id =
-			of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
-	const struct ci_hdrc_imx_platform_flag *imx_platform_flag = of_id->data;
+	const struct of_device_id *of_id;
+	const struct ci_hdrc_imx_platform_flag *imx_platform_flag;
+
+	of_id = of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
+	if (!of_id)
+		return -ENODEV;
+
+	imx_platform_flag = of_id->data;
 
 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
-- 
2.4.10

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