diff options
| author | Sara Sharon <sara.sharon@intel.com> | 2018-12-15 12:03:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-13 11:51:01 +0300 |
| commit | 4f784484bd96937dd86c41ec06cdac4f86c5300b (patch) | |
| tree | 46cd851db96b23e574d1631108f7b75d1a99e13b /net | |
| parent | 97fd4c7f6ddf1fefcce7e684f1eeb895b9fdf387 (diff) | |
| download | linux-4f784484bd96937dd86c41ec06cdac4f86c5300b.tar.xz | |
mac80211: fix a kernel panic when TXing after TXQ teardown
[ Upstream commit a50e5fb8db83c5b57392204c21ea6c5c4ccefde6 ]
Recently TXQ teardown was moved earlier in ieee80211_unregister_hw(),
to avoid a use-after-free of the netdev data. However, interfaces
aren't fully removed at the point, and cfg80211_shutdown_all_interfaces
can for example, TX a deauth frame. Move the TXQ teardown to the
point between cfg80211_shutdown_all_interfaces and the free of
netdev queues, so we can be sure they are torn down before netdev
is freed, but after there is no ongoing TX.
Fixes: 77cfaf52eca5 ("mac80211: Run TXQ teardown code before de-registering interfaces")
Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/iface.c | 3 | ||||
| -rw-r--r-- | net/mac80211/main.c | 2 |
2 files changed, 3 insertions, 2 deletions
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 5f3c81e705c7..3a0171a65db3 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -7,6 +7,7 @@ * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> * Copyright 2013-2014 Intel Mobile Communications GmbH * Copyright (c) 2016 Intel Deutschland GmbH + * Copyright (C) 2018 Intel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -1951,6 +1952,8 @@ void ieee80211_remove_interfaces(struct ieee80211_local *local) WARN(local->open_count, "%s: open count remains %d\n", wiphy_name(local->hw.wiphy), local->open_count); + ieee80211_txq_teardown_flows(local); + mutex_lock(&local->iflist_mtx); list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { list_del(&sdata->list); diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 513627896204..68db2a356443 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -1198,7 +1198,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) rtnl_unlock(); ieee80211_led_exit(local); ieee80211_wep_free(local); - ieee80211_txq_teardown_flows(local); fail_flows: destroy_workqueue(local->workqueue); fail_workqueue: @@ -1224,7 +1223,6 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw) #if IS_ENABLED(CONFIG_IPV6) unregister_inet6addr_notifier(&local->ifa6_notifier); #endif - ieee80211_txq_teardown_flows(local); rtnl_lock(); |