From 77f807e34765258d91104c61f2a3bf64d4c3477b Mon Sep 17 00:00:00 2001 From: Tom Hughes Date: Mon, 29 Jun 2015 19:41:49 +0100 Subject: mac80211: clear subdir_stations when removing debugfs commit 4479004e6409087d1b4986881dc98c6c15dffb28 upstream. If we don't do this, and we then fail to recreate the debugfs directory during a mode change, then we will fail later trying to add stations to this now bogus directory: BUG: unable to handle kernel NULL pointer dereference at 0000006c IP: [] mutex_lock+0x12/0x30 Call Trace: [] start_creating+0x44/0xc0 [] debugfs_create_dir+0x13/0xf0 [] ieee80211_sta_debugfs_add+0x6e/0x490 [mac80211] Signed-off-by: Tom Hughes Signed-off-by: Johannes Berg [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- net/mac80211/debugfs_netdev.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c index 880a55d..0228ecb 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -598,6 +598,7 @@ void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata) debugfs_remove_recursive(sdata->debugfs.dir); sdata->debugfs.dir = NULL; + sdata->debugfs.subdir_stations = NULL; } void ieee80211_debugfs_rename_netdev(struct ieee80211_sub_if_data *sdata) -- cgit v1.1