linux-kernel - [PATCH v2] mtd: fsl-quadspi: possible NULL dereference

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Message-Id: <1447699530-50014-1-git-send-email-computersforpeace@gmail.com>
Date:	Mon, 16 Nov 2015 10:45:30 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	<linux-mtd@...ts.infradead.org>
Cc:	Brian Norris <computersforpeace@...il.com>,
	<linux-kernel@...r.kernel.org>, Han Xu <han.xu@...escale.com>
Subject: [PATCH v2] mtd: fsl-quadspi: possible NULL dereference

It is theoretically possible to probe this driver without a matching
device tree, so let's guard against this.

Also, use the of_device_get_match_data() helper to make this a bit
simpler.

Coverity complained about this one.

Signed-off-by: Brian Norris <computersforpeace@...il.com>
Cc: Han Xu <han.xu@...escale.com>
---
v2:
 * missed a 'const' warning
 * s/reference/dereference in $subject

 drivers/mtd/spi-nor/fsl-quadspi.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index cc3a70b9b020..916d6dd5b575 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -269,7 +269,7 @@ struct fsl_qspi {
 	struct clk *clk, *clk_en;
 	struct device *dev;
 	struct completion c;
-	struct fsl_qspi_devtype_data *devtype_data;
+	const struct fsl_qspi_devtype_data *devtype_data;
 	u32 nor_size;
 	u32 nor_num;
 	u32 clk_rate;
@@ -933,8 +933,6 @@ static int fsl_qspi_probe(struct platform_device *pdev)
 	struct spi_nor *nor;
 	struct mtd_info *mtd;
 	int ret, i = 0;
-	const struct of_device_id *of_id =
-			of_match_device(fsl_qspi_dt_ids, &pdev->dev);
 
 	q = devm_kzalloc(dev, sizeof(*q), GFP_KERNEL);
 	if (!q)
@@ -945,7 +943,9 @@ static int fsl_qspi_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	q->dev = dev;
-	q->devtype_data = (struct fsl_qspi_devtype_data *)of_id->data;
+	q->devtype_data = of_device_get_match_data(dev);
+	if (!q->devtype_data)
+		return -ENODEV;
 	platform_set_drvdata(pdev, q);
 
 	/* find the resources */
-- 
2.6.0.rc2.230.g3dd15c0

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