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mac80211: Fix kernel panic due to use of txq after free
[ Upstream commit f1267cf3c0
]
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@codeaurora.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 3 additions and 0 deletions
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@ -1924,6 +1924,9 @@ void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
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list_del_rcu(&sdata->list);
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mutex_unlock(&sdata->local->iflist_mtx);
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if (sdata->vif.txq)
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ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
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synchronize_rcu();
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if (sdata->dev) {
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