linux-kernel - [PATCH 4.9 112/151] ath9k_hw: fix uninitialized variable data

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Message-Id: <20191127203043.201695755@linuxfoundation.org>
Date:   Wed, 27 Nov 2019 21:31:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Rajkumar Manoharan <rmanohar@....qualcomm.com>,
        "John W. Linville" <linville@...driver.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Denis Efremov <efremov@...ux.com>
Subject: [PATCH 4.9 112/151] ath9k_hw: fix uninitialized variable data

From: Denis Efremov <efremov@...ux.com>

commit 80e84f36412e0c5172447b6947068dca0d04ee82 upstream.

Currently, data variable in ar9003_hw_thermo_cal_apply() could be
uninitialized if ar9300_otp_read_word() will fail to read the value.
Initialize data variable with 0 to prevent an undefined behavior. This
will be enough to handle error case when ar9300_otp_read_word() fails.

Fixes: 80fe43f2bbd5 ("ath9k_hw: Read and configure thermocal for AR9462")
Cc: Rajkumar Manoharan <rmanohar@....qualcomm.com>
Cc: John W. Linville <linville@...driver.com>
Cc: Kalle Valo <kvalo@...eaurora.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: stable@...r.kernel.org
Signed-off-by: Denis Efremov <efremov@...ux.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/ath/ath9k/ar9003_eeprom.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -4115,7 +4115,7 @@ static void ar9003_hw_thermometer_apply(

 static void ar9003_hw_thermo_cal_apply(struct ath_hw *ah)
 {
-	u32 data, ko, kg;
+	u32 data = 0, ko, kg;

 	if (!AR_SREV_9462_20_OR_LATER(ah))
 		return;