| From 4479004e6409087d1b4986881dc98c6c15dffb28 Mon Sep 17 00:00:00 2001 |
| From: Tom Hughes <tom@compton.nu> |
| 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: [<c0a92202>] mutex_lock+0x12/0x30 |
| Call Trace: |
| [<c0678ab4>] start_creating+0x44/0xc0 |
| [<c0679203>] debugfs_create_dir+0x13/0xf0 |
| [<f8a938ae>] ieee80211_sta_debugfs_add+0x6e/0x490 [mac80211] |
| |
| Signed-off-by: Tom Hughes <tom@compton.nu> |
| Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
| [lizf: Backported to 3.4: adjust context] |
| Signed-off-by: Zefan Li <lizefan@huawei.com> |
| --- |
| net/mac80211/debugfs_netdev.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/net/mac80211/debugfs_netdev.c |
| +++ b/net/mac80211/debugfs_netdev.c |
| @@ -700,6 +700,7 @@ void ieee80211_debugfs_remove_netdev(str |
| |
| 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) |
