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mac80211: Run TXQ teardown code before de-registering interfaces 

[ Upstream commit 77cfaf52ec ]

The TXQ teardown code can reference the vif data structures that are
stored in the netdev private memory area if there are still packets on
the queue when it is being freed. Since the TXQ teardown code is run
after the netdevs are freed, this can lead to a use-after-free. Fix this
by moving the TXQ teardown code to earlier in ieee80211_unregister_hw().

Reported-by: Ben Greear <greearb@candelatech.com>
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Toke Høiland-Jørgensen 2018-08-13 14:16:25 +02:00 committed by Greg Kroah-Hartman
parent 3a738e7f73
commit 4ae9a73be7
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/main.c
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@ -1171,6 +1171,7 @@ 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();
@ -1199,7 +1200,6 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
skb_queue_purge(&local->skb_queue);
skb_queue_purge(&local->skb_queue_unreliable);
skb_queue_purge(&local->skb_queue_tdls_chsw);
ieee80211_txq_teardown_flows(local);
destroy_workqueue(local->workqueue);
wiphy_unregister(local->hw.wiphy);