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Date: Thu, 23 May 2019 21:06:45 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Bhagavathi Perumal S <bperumal@...eaurora.org>, Toke Høiland-Jørgensen <toke@...hat.com>, Johannes Berg <johannes.berg@...el.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.0 117/139] mac80211: Fix kernel panic due to use of txq after free [ Upstream commit f1267cf3c01b12e0f843fb6a7450a7f0b2efab8a ] The txq of vif is added to active_txqs list for ATF TXQ scheduling in the function ieee80211_queue_skb(), but it was not properly removed before freeing the txq object. It was causing use after free of the txq objects from the active_txqs list, result was kernel panic due to invalid memory access. Fix kernel invalid memory access by properly removing txq object from active_txqs list before free the object. Signed-off-by: Bhagavathi Perumal S <bperumal@...eaurora.org> Acked-by: Toke Høiland-Jørgensen <toke@...hat.com> Signed-off-by: Johannes Berg <johannes.berg@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- net/mac80211/iface.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 4a6ff1482a9ff..02d2e6f11e936 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -1908,6 +1908,9 @@ void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata) list_del_rcu(&sdata->list); mutex_unlock(&sdata->local->iflist_mtx); + if (sdata->vif.txq) + ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq)); + synchronize_rcu(); if (sdata->dev) { -- 2.20.1
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