linux-kernel - [PATCH] Net: ethernet: freescale - Fix possible NULL derefrence.

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Date:   Fri, 27 Jan 2017 16:43:14 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Javier Martinez Canillas <javier@....samsung.com>,
        linux-kernel@...r.kernel.org, p.shailesh@...sung.com,
        ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.v@...sung.com>,
        Shailendra Verma <shailendra.capricorn@...il.com>
Subject: [PATCH] Net: ethernet: freescale - Fix possible NULL derefrence.

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

Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
---
 drivers/net/ethernet/freescale/fsl_pq_mdio.c |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fsl_pq_mdio.c b/drivers/net/ethernet/freescale/fsl_pq_mdio.c
index 446c7b3..79393fe 100644
--- a/drivers/net/ethernet/freescale/fsl_pq_mdio.c
+++ b/drivers/net/ethernet/freescale/fsl_pq_mdio.c
@@ -379,9 +379,8 @@ static void ucc_configure(phys_addr_t start, phys_addr_t end)
 
 static int fsl_pq_mdio_probe(struct platform_device *pdev)
 {
-	const struct of_device_id *id =
-		of_match_device(fsl_pq_mdio_match, &pdev->dev);
-	const struct fsl_pq_mdio_data *data = id->data;
+	const struct of_device_id *id;
+	const struct fsl_pq_mdio_data *data;
 	struct device_node *np = pdev->dev.of_node;
 	struct resource res;
 	struct device_node *tbi;
@@ -389,6 +388,14 @@ static int fsl_pq_mdio_probe(struct platform_device *pdev)
 	struct mii_bus *new_bus;
 	int err;
 
+	id = of_match_device(fsl_pq_mdio_match, &pdev->dev);
+	if (!id) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
+
+	data = id->data;
+
 	dev_dbg(&pdev->dev, "found %s compatible node\n", id->compatible);
 
 	new_bus = mdiobus_alloc_size(sizeof(*priv));
-- 
1.7.9.5