linux-kernel - [PATCH] wifi: ath12k: fix potential NULL dereference

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Date: Fri, 14 Jun 2024 20:32:20 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Pradeep Kumar Chitrapu <quic_pradeepc@...cinc.com>
Cc: Kalle Valo <kvalo@...nel.org>, Jeff Johnson <jjohnson@...nel.org>,
	linux-wireless@...r.kernel.org, ath12k@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] wifi: ath12k: fix potential NULL dereference

In this condition if "sband" is NULL then it leads to a NULL dereference
on the next line when it does "idx -= sband->n_channels;".

The condition can just be deleted, because if "sband" is NULL or the
"idx" is out of bounds, then the correct thing is to at this point is to
return -ENOENT.  There are no additional sbands available to try.

Fixes: 70e3be54bbdd ("wifi: ath12k: fix survey dump collection in 6 GHz")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/net/wireless/ath/ath12k/mac.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 509c02bffdae..e5456383dabd 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -8314,11 +8314,6 @@ static int ath12k_mac_op_get_survey(struct ieee80211_hw *hw, int idx,
 
 	if (!sband)
 		sband = hw->wiphy->bands[NL80211_BAND_6GHZ];
-	if (!sband || idx >= sband->n_channels) {
-		idx -= sband->n_channels;
-		sband = NULL;
-	}
-
 	if (!sband || idx >= sband->n_channels)
 		return -ENOENT;
 
-- 
2.43.0