linux-kernel - [PATCH 3.16 010/148] ath9k_hw: fix uninitialized variable data

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Date:   Sat, 08 Feb 2020 18:19:09 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>,
        "John W. Linville" <linville@...driver.com>,
        "Denis Efremov" <efremov@...ux.com>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Rajkumar Manoharan" <rmanohar@....qualcomm.com>
Subject: [PATCH 3.16 010/148] ath9k_hw: fix uninitialized variable data

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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>
Signed-off-by: Denis Efremov <efremov@...ux.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -4107,7 +4107,7 @@ 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;