linux-kernel - [PATCH AUTOSEL 6.7 032/108] wifi: ath9k: Fix potential array-index-out-of-bounds read in ath9k_htc

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Date: Tue, 16 Jan 2024 14:38:58 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Minsuk Kang <linuxlovemin@...sei.ac.kr>,
	Toke Høiland-Jørgensen <toke@...e.dk>,
	Kalle Valo <quic_kvalo@...cinc.com>,
	Sasha Levin <sashal@...nel.org>,
	kvalo@...nel.org,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.7 032/108] wifi: ath9k: Fix potential array-index-out-of-bounds read in ath9k_htc_txstatus()

From: Minsuk Kang <linuxlovemin@...sei.ac.kr>

[ Upstream commit 2adc886244dff60f948497b59affb6c6ebb3c348 ]

Fix an array-index-out-of-bounds read in ath9k_htc_txstatus(). The bug
occurs when txs->cnt, data from a URB provided by a USB device, is
bigger than the size of the array txs->txstatus, which is
HTC_MAX_TX_STATUS. WARN_ON() already checks it, but there is no bug
handling code after the check. Make the function return if that is the
case.

Found by a modified version of syzkaller.

UBSAN: array-index-out-of-bounds in htc_drv_txrx.c
index 13 is out of range for type '__wmi_event_txstatus [12]'
Call Trace:
 ath9k_htc_txstatus
 ath9k_wmi_event_tasklet
 tasklet_action_common
 __do_softirq
 irq_exit_rxu
 sysvec_apic_timer_interrupt

Signed-off-by: Minsuk Kang <linuxlovemin@...sei.ac.kr>
Acked-by: Toke Høiland-Jørgensen <toke@...e.dk>
Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>
Link: https://lore.kernel.org/r/20231113065756.1491991-1-linuxlovemin@yonsei.ac.kr
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/ath9k/htc_drv_txrx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
index 800177021baf..efcaeccb055a 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
@@ -652,9 +652,10 @@ void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
 	struct ath9k_htc_tx_event *tx_pend;
 	int i;
 
-	for (i = 0; i < txs->cnt; i++) {
-		WARN_ON(txs->cnt > HTC_MAX_TX_STATUS);
+	if (WARN_ON_ONCE(txs->cnt > HTC_MAX_TX_STATUS))
+		return;
 
+	for (i = 0; i < txs->cnt; i++) {
 		__txs = &txs->txstatus[i];
 
 		skb = ath9k_htc_tx_get_packet(priv, __txs);
-- 
2.43.0