mac80211: fix debugfs default key oops
Under certain circumstances (in AP mode) the debugfs function
that is supposed to add the default key symlink can encounter
a NULL default_key pointer. This patch makes it handle that
situtation gracefully.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c
index 879e721..19efc3a 100644
--- a/net/mac80211/debugfs_key.c
+++ b/net/mac80211/debugfs_key.c
@@ -255,14 +255,23 @@
void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
{
char buf[50];
+ struct ieee80211_key *key;
if (!sdata->debugfsdir)
return;
- sprintf(buf, "../keys/%d", sdata->default_key->debugfs.cnt);
- sdata->debugfs.default_key =
- debugfs_create_symlink("default_key", sdata->debugfsdir, buf);
+ /* this is running under the key lock */
+
+ key = sdata->default_key;
+ if (key) {
+ sprintf(buf, "../keys/%d", key->debugfs.cnt);
+ sdata->debugfs.default_key =
+ debugfs_create_symlink("default_key",
+ sdata->debugfsdir, buf);
+ } else
+ ieee80211_debugfs_key_remove_default(sdata);
}
+
void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
{
if (!sdata)