ns83820: Avoid bad pointer deref in ns83820_init_one().

In drivers/net/ns83820.c::ns83820_init_one() we dynamically allocate
memory via alloc_etherdev(). We then call PRIV() on the returned storage
which is 'return netdev_priv()'. netdev_priv() takes the pointer it is
passed and adds 'ALIGN(sizeof(struct net_device), NETDEV_ALIGN)' to it and
returns it. Then we test the resulting pointer for NULL, which it is
unlikely to be at this point, and later dereference it. This will go bad
if alloc_etherdev() actually returned NULL.

This patch reworks the code slightly so that we test for a NULL pointer
(and return -ENOMEM) directly after calling alloc_etherdev().

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ns83820.c b/drivers/net/ns83820.c
index 84134c7..a41b2cf 100644 (file)
--- a/drivers/net/ns83820.c
+++ b/drivers/net/ns83820.c
@@ -1988,12 +1988,11 @@ static int __devinit ns83820_init_one(struct pci_dev *pci_dev,
        }
 
        ndev = alloc_etherdev(sizeof(struct ns83820));
-       dev = PRIV(ndev);
-
        err = -ENOMEM;
-       if (!dev)
+       if (!ndev)
                goto out;
 
+       dev = PRIV(ndev);
        dev->ndev = ndev;
 
        spin_lock_init(&dev->rx_info.lock);