From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from youngberry.canonical.com ([91.189.89.112]:48523 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752846AbbH0WM2 (ORCPT ); Thu, 27 Aug 2015 18:12:28 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Tom Hughes , Johannes Berg , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 017/130] mac80211: clear subdir_stations when removing debugfs Date: Thu, 27 Aug 2015 15:10:08 -0700 Message-Id: <1440713521-5906-18-git-send-email-kamal@canonical.com> In-Reply-To: <1440713521-5906-1-git-send-email-kamal@canonical.com> References: <1440713521-5906-1-git-send-email-kamal@canonical.com> Sender: stable-owner@vger.kernel.org List-ID: 3.19.8-ckt6 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Tom Hughes 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 Signed-off-by: Kamal Mostafa --- 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