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>
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 11120bb..0f47948 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -496,6 +496,8 @@
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;
}