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rionet: fix NULL pointer dereference in rionet_remove 

Function rionet_remove initializes local variable 'ndev' to NULL
and do nothing changes before the call to unregister_netdev(ndev),
this could cause a NULL pointer dereference.

Reported-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Yinglin Luan <synmyth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yinglin Luan 2011-06-25 18:12:12 +00:00 committed by David S. Miller
parent 7ab24bfdf9
commit 55caa9241e
1 changed files with 15 additions and 13 deletions
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28
drivers/net/rionet.c
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@ -378,7 +378,7 @@ static int rionet_close(struct net_device *ndev)
static void rionet_remove(struct rio_dev *rdev)
{
struct net_device *ndev = NULL;
struct net_device *ndev = rio_get_drvdata(rdev);
struct rionet_peer *peer, *tmp;
free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
@ -433,22 +433,12 @@ static const struct net_device_ops rionet_netdev_ops = {
.ndo_set_mac_address = eth_mac_addr,
};
static int rionet_setup_netdev(struct rio_mport *mport)
static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
{
int rc = 0;
struct net_device *ndev = NULL;
struct rionet_private *rnet;
u16 device_id;
/* Allocate our net_device structure */
ndev = alloc_etherdev(sizeof(struct rionet_private));
if (ndev == NULL) {
printk(KERN_INFO "%s: could not allocate ethernet device.\n",
DRV_NAME);
rc = -ENOMEM;
goto out;
}
rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
mport->sys_size ? __fls(sizeof(void *)) + 4 : 0);
if (!rionet_active) {
@ -504,11 +494,21 @@ static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
int rc = -ENODEV;
u32 lpef, lsrc_ops, ldst_ops;
struct rionet_peer *peer;
struct net_device *ndev = NULL;
/* If local device is not rionet capable, give up quickly */
if (!rionet_capable)
goto out;
/* Allocate our net_device structure */
ndev = alloc_etherdev(sizeof(struct rionet_private));
if (ndev == NULL) {
printk(KERN_INFO "%s: could not allocate ethernet device.\n",
DRV_NAME);
rc = -ENOMEM;
goto out;
}
/*
* First time through, make sure local device is rionet
* capable, setup netdev, and set flags so this is skipped
@ -529,7 +529,7 @@ static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
goto out;
}
rc = rionet_setup_netdev(rdev->net->hport);
rc = rionet_setup_netdev(rdev->net->hport, ndev);
rionet_check = 1;
}
@ -546,6 +546,8 @@ static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
list_add_tail(&peer->node, &rionet_peers);
}
rio_set_drvdata(rdev, ndev);
out:
return rc;
}