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Subject[ 164/187] mwifiex: fix wrong return values in add_virtual_intf() error cases
Date
From: Greg KH <gregkh@linuxfoundation.org>

3.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Bing Zhao <bzhao@marvell.com>

commit 858faa57dd9e2b91f3f870fbb1185982e42f5a2b upstream

add_virtual_intf() needs to return an ERR_PTR(), instead of NULL,
on errors, otherwise cfg80211 will crash.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/wireless/mwifiex/cfg80211.c | 21 +++++++++------------
1 file changed, 9 insertions(+), 12 deletions(-)

--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -1214,11 +1214,11 @@ struct net_device *mwifiex_add_virtual_i
void *mdev_priv;

if (!priv)
- return NULL;
+ return ERR_PTR(-EFAULT);

adapter = priv->adapter;
if (!adapter)
- return NULL;
+ return ERR_PTR(-EFAULT);

switch (type) {
case NL80211_IFTYPE_UNSPECIFIED:
@@ -1227,7 +1227,7 @@ struct net_device *mwifiex_add_virtual_i
if (priv->bss_mode) {
wiphy_err(wiphy, "cannot create multiple"
" station/adhoc interfaces\n");
- return NULL;
+ return ERR_PTR(-EINVAL);
}

if (type == NL80211_IFTYPE_UNSPECIFIED)
@@ -1244,14 +1244,15 @@ struct net_device *mwifiex_add_virtual_i
break;
default:
wiphy_err(wiphy, "type not supported\n");
- return NULL;
+ return ERR_PTR(-EINVAL);
}

dev = alloc_netdev_mq(sizeof(struct mwifiex_private *), name,
ether_setup, 1);
if (!dev) {
wiphy_err(wiphy, "no memory available for netdevice\n");
- goto error;
+ priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
+ return ERR_PTR(-ENOMEM);
}

dev_net_set(dev, wiphy_net(wiphy));
@@ -1276,7 +1277,9 @@ struct net_device *mwifiex_add_virtual_i
/* Register network device */
if (register_netdevice(dev)) {
wiphy_err(wiphy, "cannot register virtual network device\n");
- goto error;
+ free_netdev(dev);
+ priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
+ return ERR_PTR(-EFAULT);
}

sema_init(&priv->async_sem, 1);
@@ -1288,12 +1291,6 @@ struct net_device *mwifiex_add_virtual_i
mwifiex_dev_debugfs_init(priv);
#endif
return dev;
-error:
- if (dev && (dev->reg_state == NETREG_UNREGISTERED))
- free_netdev(dev);
- priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
-
- return NULL;
}
EXPORT_SYMBOL_GPL(mwifiex_add_virtual_intf);




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