[PATCH AUTOSEL for 4.4 108/167] net: freescale: fix potential null pointer dereference

[Sasha Levin]

From: "Gustavo A. R. Silva" <garsi...@embeddedor.com>

[ Upstream commit 06d2d6431bc8d41ef5ffd8bd4b52cea9f72aed22 ]

Add NULL check before dereferencing pointer _id_ in order to avoid
a potential NULL pointer dereference.

Addresses-Coverity-ID: 1397995
Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/net/ethernet/freescale/fsl_pq_mdio.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fsl_pq_mdio.c 
b/drivers/net/ethernet/freescale/fsl_pq_mdio.c
index 40071dad1c57..9c76f1a2f57b 100644
--- a/drivers/net/ethernet/freescale/fsl_pq_mdio.c
+++ b/drivers/net/ethernet/freescale/fsl_pq_mdio.c
@@ -382,7 +382,7 @@ 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 fsl_pq_mdio_data *data;
        struct device_node *np = pdev->dev.of_node;
        struct resource res;
        struct device_node *tbi;
@@ -390,6 +390,13 @@ static int fsl_pq_mdio_probe(struct platform_device *pdev)
        struct mii_bus *new_bus;
        int err;
 
+       if (!id) {
+               dev_err(&pdev->dev, "Failed to match device\n");
+               return -ENODEV;
+       }
+
+       data = id->data;
+
        dev_dbg(&pdev->dev, "found %s compatible node\n", id->compatible);
 
        new_bus = mdiobus_alloc_size(sizeof(*priv));
-- 
2.14.1