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cfg80211: clear wext keys when freeing and removing them 

When freeing the keys stored for wireless extensions, clear the memory
to avoid having the key material stick around in memory "forever".
Similarly, when userspace overwrites a key, actually clear it instead
of just setting the key length to zero.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2014-09-10 13:39:56 +03:00
parent 29c3f9c399
commit 538c9eb8b3
2 changed files with 3 additions and 1 deletions
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2
net/wireless/core.c
View File

@ -1007,7 +1007,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
rdev->devlist_generation++;
cfg80211_mlme_purge_registrations(wdev);
#ifdef CONFIG_CFG80211_WEXT
kfree(wdev->wext.keys);
kzfree(wdev->wext.keys);
#endif
}
/*

2
net/wireless/wext-compat.c
View File

@ -496,6 +496,8 @@ static int __cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
err = 0;
if (!err) {
if (!addr) {
memset(wdev->wext.keys->data[idx], 0,
sizeof(wdev->wext.keys->data[idx]));
wdev->wext.keys->params[idx].key_len = 0;
wdev->wext.keys->params[idx].cipher = 0;
}