From: lily <floridsleeves@xxxxxxxxx> Check the return value of rcu_dereference_protected_tid_tx(), which could be NULL and result in null pointer dereference if not checked. Signed-off-by: Li Zhong <floridsleeves@xxxxxxxxx> --- net/mac80211/agg-tx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c index 07c892aa8c73..ce5f4a39bce2 100644 --- a/net/mac80211/agg-tx.c +++ b/net/mac80211/agg-tx.c @@ -503,6 +503,8 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) int ret; tid_tx = rcu_dereference_protected_tid_tx(sta, tid); + if (!tid_tx) + return; /* * Start queuing up packets for this aggregation session. @@ -742,6 +744,8 @@ static void ieee80211_agg_tx_operational(struct ieee80211_local *local, lockdep_assert_held(&sta->ampdu_mlme.mtx); tid_tx = rcu_dereference_protected_tid_tx(sta, tid); + if (!tid_tx) + return; params.buf_size = tid_tx->buf_size; params.amsdu = tid_tx->amsdu; -- 2.25.1
