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nl80211: use __cfg80211_rdev_from_attrs for testmode

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To fix the testmode cross-namespace access problem,
use __cfg80211_rdev_from_attrs() to get the device
instead of open-coding similar functionality.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-06-15 14:23:16 +02:00
parent 878d9ec736
commit 2bd7e35da0
1 changed files with 10 additions and 13 deletions
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23
net/wireless/nl80211.c
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@ -5230,21 +5230,18 @@ static int nl80211_testmode_dump(struct sk_buff *skb,
nl80211_policy);
if (err)
return err;
if (nl80211_fam.attrbuf[NL80211_ATTR_WIPHY]) {
phy_idx = nla_get_u32(
nl80211_fam.attrbuf[NL80211_ATTR_WIPHY]);
} else {
struct net_device *netdev;
err = get_rdev_dev_by_ifindex(sock_net(skb->sk),
nl80211_fam.attrbuf,
&rdev, &netdev);
if (err)
return err;
dev_put(netdev);
phy_idx = rdev->wiphy_idx;
cfg80211_unlock_rdev(rdev);
mutex_lock(&cfg80211_mutex);
rdev = __cfg80211_rdev_from_attrs(sock_net(skb->sk),
nl80211_fam.attrbuf);
if (IS_ERR(rdev)) {
mutex_unlock(&cfg80211_mutex);
return PTR_ERR(rdev);
}
phy_idx = rdev->wiphy_idx;
rdev = NULL;
mutex_unlock(&cfg80211_mutex);
if (nl80211_fam.attrbuf[NL80211_ATTR_TESTDATA])
cb->args[1] =
(long)nl80211_fam.attrbuf[NL80211_ATTR_TESTDATA];