net: dsa: loop: Check for memory allocation failure

If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
Return -ENOMEM instead, as done for some other memory allocation just a
few lines above.

Fixes: 98cd1552ea27 ("net: dsa: Mock-up driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c
index f0fc4de4fc9a4854ac6b2d6926ed549fed71ce26..a19e1781e9bbf353bf747d238249f0795f2f59cd 100644 (file)
--- a/drivers/net/dsa/dsa_loop.c
+++ b/drivers/net/dsa/dsa_loop.c
@@ -256,6 +256,9 @@ static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
                return -ENOMEM;
 
        ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
+       if (!ps)
+               return -ENOMEM;
+
        ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
        if (!ps->netdev)
                return -EPROBE_DEFER;