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Message-Id: <1440713521-5906-18-git-send-email-kamal@canonical.com>
Date: Thu, 27 Aug 2015 15:10:08 -0700
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Tom Hughes <tom@...pton.nu>,
Johannes Berg <johannes.berg@...el.com>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 017/130] mac80211: clear subdir_stations when removing debugfs
3.19.8-ckt6 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Tom Hughes <tom@...pton.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@...pton.nu>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
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 c68896a..2d19963 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -725,6 +725,7 @@ void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
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)
--
1.9.1
--
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