diff options
| author | Jesper Juhl <jj@chaosbits.net> | 2011-01-17 13:24:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-01-19 03:13:49 +0300 |
| commit | 1956cc52e73984a39252994f0beee458fc0d8909 (patch) | |
| tree | aac01b12ee07ed2f5dd03ffdd77daee08ef85461 | |
| parent | 2fdc1c8093255f9da877d7b9ce3f46c2098377dc (diff) | |
| download | linux-1956cc52e73984a39252994f0beee458fc0d8909.tar.xz | |
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>
| -rw-r--r-- | drivers/net/ns83820.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/net/ns83820.c b/drivers/net/ns83820.c index 84134c766f3a..a41b2cf4d917 100644 --- 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); |