Patch "mac80211: clear subdir_stations when removing debugfs" has been added to the 3.10-stable tree

Patch "mac80211: clear subdir_stations when removing debugfs" has been added to the 3.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mac80211: clear subdir_stations when removing debugfs

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mac80211-clear-subdir_stations-when-removing-debugfs.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>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

From: Tom Hughes <tom@compton.nu>

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/mac80211/debugfs_netdev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -697,6 +697,7 @@ void ieee80211_debugfs_remove_netdev(str
 
 	debugfs_remove_recursive(sdata->vif.debugfs_dir);
 	sdata->vif.debugfs_dir = NULL;
+	sdata->debugfs.subdir_stations = NULL;
 }
 
 void ieee80211_debugfs_rename_netdev(struct ieee80211_sub_if_data *sdata)


Patches currently in stable-queue which might be from tom@compton.nu are

queue-3.10/mac80211-clear-subdir_stations-when-removing-debugfs.patch