linux-kernel - [PATCH AUTOSEL 6.1 08/24] wifi: iwlwifi: pcie: avoid a NULL pointer dereference

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Date: Mon, 25 Dec 2023 19:22:01 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Avraham Stern <avraham.stern@...el.com>,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	gregory.greenman@...el.com,
	kvalo@...nel.org,
	benjamin.berg@...el.com,
	kuba@...nel.org,
	ansuelsmth@...il.com,
	pagadala.yesu.anjaneyulu@...el.com,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 08/24] wifi: iwlwifi: pcie: avoid a NULL pointer dereference

From: Avraham Stern <avraham.stern@...el.com>

[ Upstream commit ce038edfce43fb345f8dfdca0f7b17f535896701 ]

It possible that while the rx rb is being handled, the transport has
been stopped and re-started. In this case the tx queue pointer is not
yet initialized, which will lead to a NULL pointer dereference.
Fix it.

Signed-off-by: Avraham Stern <avraham.stern@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://msgid.link/20231207044813.cd0898cafd89.I0b84daae753ba9612092bf383f5c6f761446e964@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
index 90a46faaaffdf..260500427634c 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
@@ -1381,7 +1381,7 @@ static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
 		 * if it is true then one of the handlers took the page.
 		 */
 
-		if (reclaim) {
+		if (reclaim && txq) {
 			u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 			int index = SEQ_TO_INDEX(sequence);
 			int cmd_index = iwl_txq_get_cmd_index(txq, index);
-- 
2.43.0