linux-kernel - [PATCH 6.6 190/638] wifi: ath12k: fix incorrect logic of calculating vdev_stats

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Date: Sun, 24 Mar 2024 18:53:47 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Kang Yang <quic_kangyang@...cinc.com>,
	Jeff Johnson <quic_jjohnson@...cinc.com>,
	Kalle Valo <quic_kvalo@...cinc.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.6 190/638] wifi: ath12k: fix incorrect logic of calculating vdev_stats_id

From: Kang Yang <quic_kangyang@...cinc.com>

[ Upstream commit 019b58dcb6ed267e17b7efd03ec8575c1b67d942 ]

During calculate vdev_stats_id, will compare vdev_stats_id with
ATH12K_INVAL_VDEV_STATS_ID by '<='. If vdev_stats_id is relatively
small, then assign ATH12K_INVAL_VDEV_STATS_ID to vdev_stats_id.

This logic is incorrect. Firstly, should use '>=' instead of '<=' to
check if this u8 variable exceeds the max valid range.

Secondly, should use the maximum value as comparison value.

Correct comparison symbols and use the maximum value
ATH12K_MAX_VDEV_STATS_ID for comparison.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Kang Yang <quic_kangyang@...cinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@...cinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>
Link: https://msgid.link/20240130040303.370590-3-quic_kangyang@quicinc.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/ath12k/mac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index a8a71478baea8..61435e4489b9f 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -5152,7 +5152,7 @@ ath12k_mac_get_vdev_stats_id(struct ath12k_vif *arvif)
 	do {
 		if (ab->free_vdev_stats_id_map & (1LL << vdev_stats_id)) {
 			vdev_stats_id++;
-			if (vdev_stats_id <= ATH12K_INVAL_VDEV_STATS_ID) {
+			if (vdev_stats_id >= ATH12K_MAX_VDEV_STATS_ID) {
 				vdev_stats_id = ATH12K_INVAL_VDEV_STATS_ID;
 				break;
 			}
-- 
2.43.0