net: ethoc: Fix early error paths

commit 386512d18b268c6182903239f9f3390f03ce4c7b upstream.

In case any operation fails before we can successfully go the point
where we would register a MDIO bus, we would be going to an error label
which involves unregistering then freeing this yet to be created MDIO
bus. Update all error paths to go to label free which is the only one
valid until either the clock is enabled, or the MDIO bus is allocated
and registered. This fixes kernel oops observed while trying to
dereference the MDIO bus structure which is not yet allocated.

Fixes: a1702857724f ("net: Add support for the OpenCores 10/100 Mbps Ethernet MAC.")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
index 251b635..b3b22f4 100644 (file)
--- a/drivers/net/ethernet/ethoc.c
+++ b/drivers/net/ethernet/ethoc.c
@@ -976,7 +976,7 @@ static int __devinit ethoc_probe(struct platform_device *pdev)
        if (!priv->iobase) {
                dev_err(&pdev->dev, "cannot remap I/O memory space\n");
                ret = -ENXIO;
-               goto error;
+               goto free;
        }
 
        if (netdev->mem_end) {
@@ -985,7 +985,7 @@ static int __devinit ethoc_probe(struct platform_device *pdev)
                if (!priv->membase) {
                        dev_err(&pdev->dev, "cannot remap memory space\n");
                        ret = -ENXIO;
-                       goto error;
+                       goto free;
                }
        } else {
                /* Allocate buffer memory */
@@ -996,7 +996,7 @@ static int __devinit ethoc_probe(struct platform_device *pdev)
                        dev_err(&pdev->dev, "cannot allocate %dB buffer\n",
                                buffer_size);
                        ret = -ENOMEM;
-                       goto error;
+                       goto free;
                }
                netdev->mem_end = netdev->mem_start + buffer_size;
                priv->dma_alloc = buffer_size;
@@ -1007,7 +1007,7 @@ static int __devinit ethoc_probe(struct platform_device *pdev)
                128, (netdev->mem_end - netdev->mem_start + 1) / ETHOC_BUFSIZ);
        if (num_bd < 4) {
                ret = -ENODEV;
-               goto error;
+               goto free;
        }
        /* num_tx must be a power of two */
        priv->num_tx = rounddown_pow_of_two(num_bd >> 1);
@@ -1019,7 +1019,7 @@ static int __devinit ethoc_probe(struct platform_device *pdev)
        priv->vma = devm_kzalloc(&pdev->dev, num_bd*sizeof(void*), GFP_KERNEL);
        if (!priv->vma) {
                ret = -ENOMEM;
-               goto error;
+               goto free;
        }
 
        /* Allow the platform setup code to pass in a MAC address. */