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Message-Id: <20230320133809.2448047-1-baijiaju@buaa.edu.cn> Date: Mon, 20 Mar 2023 21:38:09 +0800 From: Jia-Ju Bai <baijiaju@...a.edu.cn> To: johannes@...solutions.net, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com Cc: linux-wireless@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju@...a.edu.cn> Subject: [PATCH] net: mac80211: Add NULL checks for sta->sdata In a previous commit 69403bad97aa, sta->sdata can be NULL, and thus it should be checked before being used. However, in the same call stack, sta->sdata is also used in the following functions: ieee80211_ba_session_work() ___ieee80211_stop_rx_ba_session(sta) ht_dbg(sta->sdata, ...); -> No check sdata_info(sta->sdata, ...); -> No check ieee80211_send_delba(sta->sdata, ...) -> No check ___ieee80211_start_rx_ba_session(sta) ht_dbg(sta->sdata, ...); -> No check ht_dbg_ratelimited(sta->sdata, ...); -> No check ieee80211_tx_ba_session_handle_start(sta) sdata = sta->sdata; if (!sdata) -> Add check by previous commit ___ieee80211_stop_tx_ba_session(sdata) ht_dbg(sta->sdata, ...); -> No check ieee80211_start_tx_ba_cb(sdata) sdata = sta->sdata; local = sdata->local -> No check ieee80211_stop_tx_ba_cb(sdata) ht_dbg(sta->sdata, ...); -> No check Thus, to avoid possible null-pointer dereferences, the related checks should be added. These results are reported by a static tool designed by myself. Signed-off-by: Jia-Ju Bai <baijiaju@...a.edu.cn> --- net/mac80211/agg-rx.c | 68 ++++++++++++++++++++++++++----------------- net/mac80211/agg-tx.c | 16 ++++++++-- 2 files changed, 55 insertions(+), 29 deletions(-) diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c index c6fa53230450..6616970785a2 100644 --- a/net/mac80211/agg-rx.c +++ b/net/mac80211/agg-rx.c @@ -80,19 +80,21 @@ void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); __clear_bit(tid, sta->ampdu_mlme.agg_session_valid); - ht_dbg(sta->sdata, - "Rx BA session stop requested for %pM tid %u %s reason: %d\n", - sta->sta.addr, tid, - initiator == WLAN_BACK_RECIPIENT ? "recipient" : "initiator", - (int)reason); + if (sta->sdata) { + ht_dbg(sta->sdata, + "Rx BA session stop requested for %pM tid %u %s reason: %d\n", + sta->sta.addr, tid, + initiator == WLAN_BACK_RECIPIENT ? "recipient" : "initiator", + (int)reason); + } - if (drv_ampdu_action(local, sta->sdata, ¶ms)) + if (sta->sdata && drv_ampdu_action(local, sta->sdata, ¶ms)) sdata_info(sta->sdata, "HW problem - can not stop rx aggregation for %pM tid %d\n", sta->sta.addr, tid); /* check if this is a self generated aggregation halt */ - if (initiator == WLAN_BACK_RECIPIENT && tx) + if (initiator == WLAN_BACK_RECIPIENT && tx && sta->sdata) ieee80211_send_delba(sta->sdata, sta->sta.addr, tid, WLAN_BACK_RECIPIENT, reason); @@ -279,17 +281,21 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta, if (!sta->sta.deflink.ht_cap.ht_supported && !sta->sta.deflink.he_cap.has_he) { - ht_dbg(sta->sdata, - "STA %pM erroneously requests BA session on tid %d w/o HT\n", - sta->sta.addr, tid); + if (sta->sdata) { + ht_dbg(sta->sdata, + "STA %pM erroneously requests BA session on tid %d w/o HT\n", + sta->sta.addr, tid); + } /* send a response anyway, it's an error case if we get here */ goto end; } if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { - ht_dbg(sta->sdata, - "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", - sta->sta.addr, tid); + if (sta->sdata) { + ht_dbg(sta->sdata, + "Suspend in progress - Denying ADDBA request (%pM tid %d)\n", + sta->sta.addr, tid); + } goto end; } @@ -322,8 +328,10 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta, buf_size = sta->sta.max_rx_aggregation_subframes; params.buf_size = buf_size; - ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", - buf_size, sta->sta.addr); + if (sta->sdata) { + ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", + buf_size, sta->sta.addr); + } /* examine state machine */ lockdep_assert_held(&sta->ampdu_mlme.mtx); @@ -332,9 +340,11 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta, if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { struct tid_ampdu_rx *tid_rx; - ht_dbg_ratelimited(sta->sdata, - "updated AddBA Req from %pM on tid %u\n", - sta->sta.addr, tid); + if (sta->sdata) { + ht_dbg_ratelimited(sta->sdata, + "updated AddBA Req from %pM on tid %u\n", + sta->sta.addr, tid); + } /* We have no API to update the timeout value in the * driver so reject the timeout update if the timeout * changed. If it did not change, i.e., no real update, @@ -350,9 +360,11 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta, goto end; } - ht_dbg_ratelimited(sta->sdata, - "unexpected AddBA Req from %pM on tid %u\n", - sta->sta.addr, tid); + if (sta->sdata) { + ht_dbg_ratelimited(sta->sdata, + "unexpected AddBA Req from %pM on tid %u\n", + sta->sta.addr, tid); + } /* delete existing Rx BA session on the same tid */ ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, @@ -362,9 +374,11 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta, if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { ret = drv_ampdu_action(local, sta->sdata, ¶ms); - ht_dbg(sta->sdata, - "Rx A-MPDU request on %pM tid %d result %d\n", - sta->sta.addr, tid, ret); + if (sta->sdata) { + ht_dbg(sta->sdata, + "Rx A-MPDU request on %pM tid %d result %d\n", + sta->sta.addr, tid, ret); + } if (!ret) status = WLAN_STATUS_SUCCESS; goto end; @@ -401,8 +415,10 @@ void ___ieee80211_start_rx_ba_session(struct sta_info *sta, __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); ret = drv_ampdu_action(local, sta->sdata, ¶ms); - ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", - sta->sta.addr, tid, ret); + if (sta->sdata) { + ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", + sta->sta.addr, tid, ret); + } if (ret) { kfree(tid_agg_rx->reorder_buf); kfree(tid_agg_rx->reorder_time); diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c index f9514bacbd4a..03b31b6e7ac7 100644 --- a/net/mac80211/agg-tx.c +++ b/net/mac80211/agg-tx.c @@ -368,8 +368,10 @@ int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, spin_unlock_bh(&sta->lock); - ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", - sta->sta.addr, tid); + if (sta->sdata) { + ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", + sta->sta.addr, tid); + } del_timer_sync(&tid_tx->addba_resp_timer); del_timer_sync(&tid_tx->session_timer); @@ -776,7 +778,12 @@ void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid, struct tid_ampdu_tx *tid_tx) { struct ieee80211_sub_if_data *sdata = sta->sdata; - struct ieee80211_local *local = sdata->local; + struct ieee80211_local *local; + + if (!sdata) + return; + + local = sdata->local; if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) return; @@ -902,6 +909,9 @@ void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid, bool send_delba = false; bool start_txq = false; + if (!sdata) + return; + ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", sta->sta.addr, tid); -- 2.34.1
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