linux-kernel - [PATCH] wcn36xx: Initialize channel to NULL inside wcn36xx_change

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Message-Id: <20220219152912.93580-1-jrdr.linux@gmail.com>
Date:   Sat, 19 Feb 2022 20:59:12 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     loic.poulain@...aro.org, kvalo@...nel.org, davem@...emloft.net,
        kuba@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com,
        ryan.odonoghue@...aro.org
Cc:     wcn36xx@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev,
        "Souptick Joarder (HPE)" <jrdr.linux@...il.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] wcn36xx: Initialize channel to NULL inside wcn36xx_change_opchannel()

From: "Souptick Joarder (HPE)" <jrdr.linux@...il.com>

Kernel test robot reported below warning ->
drivers/net/wireless/ath/wcn36xx/main.c:409:7: warning: Branch
condition evaluates to a garbage value
[clang-analyzer-core.uninitialized.Branch]

Also code walk indicates, if channel is not found in first band,
it will break the loop and instead of exit it will go ahead and
assign a garbage value in wcn->channel which looks like a bug.

Initialize channel with NULL should avoid this issue.

Fixes: 	d6f2746691cb ("wcn36xx: Track the band and channel we are tuned to")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Souptick Joarder (HPE) <jrdr.linux@...il.com>
---
 drivers/net/wireless/ath/wcn36xx/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index 75661d449712..1a06eff07107 100644
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -394,7 +394,7 @@ static void wcn36xx_change_opchannel(struct wcn36xx *wcn, int ch)
 	struct ieee80211_vif *vif = NULL;
 	struct wcn36xx_vif *tmp;
 	struct ieee80211_supported_band *band;
-	struct ieee80211_channel *channel;
+	struct ieee80211_channel *channel = NULL;
 	unsigned long flags;
 	int i, j;
 
-- 
2.25.1