Messages in this thread Patch in this message | | | From | Kamal Mostafa <> | Subject | [PATCH 3.13.y-ckt 08/60] mac80211: clear subdir_stations when removing debugfs | Date | Tue, 1 Sep 2015 17:57:14 -0700 |
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3.13.11-ckt26 -stable review patch. If anyone has any objections, please let me know.
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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: Kamal Mostafa <kamal@canonical.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 cae3d14..a6119a2 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -705,6 +705,7 @@ 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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