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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Mordechay Goodstein <mordechay.goodstein@intel.com>,
	Luca Coelho <luciano.coelho@intel.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 132/671] iwlwifi: mvm: avoid possible access out of array.
Date: Thu, 16 Jan 2020 11:50:41 -0500
Message-ID: <20200116165940.10720-15-sashal@kernel.org> (raw)
In-Reply-To: <20200116165940.10720-1-sashal@kernel.org>

From: Mordechay Goodstein <mordechay.goodstein@intel.com>

[ Upstream commit b0d795a9ae558209656b18930c2b4def5f8fdfb8 ]

The value in txq_id can be out of array scope,
validate it before accessing the array.

Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Fixes: cf961e16620f ("iwlwifi: mvm: support dqa-mode agg on non-shared queue")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index e850aa504b60..69057701641e 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -2462,7 +2462,7 @@ int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 	struct iwl_mvm_tid_data *tid_data;
 	u16 normalized_ssn;
-	int txq_id;
+	u16 txq_id;
 	int ret;
 
 	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
@@ -2506,17 +2506,24 @@ int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 	 */
 	txq_id = mvmsta->tid_data[tid].txq_id;
 	if (txq_id == IWL_MVM_INVALID_QUEUE) {
-		txq_id = iwl_mvm_find_free_queue(mvm, mvmsta->sta_id,
-						 IWL_MVM_DQA_MIN_DATA_QUEUE,
-						 IWL_MVM_DQA_MAX_DATA_QUEUE);
-		if (txq_id < 0) {
-			ret = txq_id;
+		ret = iwl_mvm_find_free_queue(mvm, mvmsta->sta_id,
+					      IWL_MVM_DQA_MIN_DATA_QUEUE,
+					      IWL_MVM_DQA_MAX_DATA_QUEUE);
+		if (ret < 0) {
 			IWL_ERR(mvm, "Failed to allocate agg queue\n");
 			goto release_locks;
 		}
 
+		txq_id = ret;
+
 		/* TXQ hasn't yet been enabled, so mark it only as reserved */
 		mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_RESERVED;
+	} else if (WARN_ON(txq_id >= IWL_MAX_HW_QUEUES)) {
+		ret = -ENXIO;
+		IWL_ERR(mvm, "tid_id %d out of range (0, %d)!\n",
+			tid, IWL_MAX_HW_QUEUES - 1);
+		goto out;
+
 	} else if (unlikely(mvm->queue_info[txq_id].status ==
 			    IWL_MVM_QUEUE_SHARED)) {
 		ret = -ENXIO;
-- 
2.20.1


       reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116165940.10720-1-sashal@kernel.org>
2020-01-16 16:50 ` Sasha Levin [this message]
2020-01-16 16:50 ` [PATCH AUTOSEL 4.19 136/671] iwlwifi: mvm: fix A-MPDU reference assignment Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 153/671] iwlwifi: mvm: fix RSS config command Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 159/671] ath10k: fix dma unmap direction for management frames Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 187/671] mt76: usb: fix possible memory leak in mt76u_buf_free Sasha Levin
2020-01-16 16:51 ` [PATCH AUTOSEL 4.19 196/671] brcmfmac: create debugfs files for bus-specific layer Sasha Levin
2020-01-16 16:52 ` [PATCH AUTOSEL 4.19 224/671] ath10k: Fix length of wmi tlv command for protected mgmt frames Sasha Levin

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