[PATCH 6.6 199/341] rtc: nct3018y: fix possible NULL dereference

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6.6-stable review patch.  If anyone has any objections, please let me know.

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

From: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>

[ Upstream commit babfeb9cbe7ebc657bd5b3e4f9fde79f560b6acc ]

alarm_enable and alarm_flag are allowed to be NULL but will be dereferenced
later by the dev_dbg call.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <error27@xxxxxxxxx>
Closes: https://lore.kernel.org/r/202305180042.DEzW1pSd-lkp@xxxxxxxxx/
Link: https://lore.kernel.org/r/20240229222127.1878176-1-alexandre.belloni@xxxxxxxxxxx
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/rtc/rtc-nct3018y.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-nct3018y.c b/drivers/rtc/rtc-nct3018y.c
index ed4e606be8e58..c4533c0f53896 100644
--- a/drivers/rtc/rtc-nct3018y.c
+++ b/drivers/rtc/rtc-nct3018y.c
@@ -99,6 +99,8 @@ static int nct3018y_get_alarm_mode(struct i2c_client *client, unsigned char *ala
 		if (flags < 0)
 			return flags;
 		*alarm_enable = flags & NCT3018Y_BIT_AIE;
+		dev_dbg(&client->dev, "%s:alarm_enable:%x\n", __func__, *alarm_enable);
+
 	}
 
 	if (alarm_flag) {
@@ -107,11 +109,9 @@ static int nct3018y_get_alarm_mode(struct i2c_client *client, unsigned char *ala
 		if (flags < 0)
 			return flags;
 		*alarm_flag = flags & NCT3018Y_BIT_AF;
+		dev_dbg(&client->dev, "%s:alarm_flag:%x\n", __func__, *alarm_flag);
 	}
 
-	dev_dbg(&client->dev, "%s:alarm_enable:%x alarm_flag:%x\n",
-		__func__, *alarm_enable, *alarm_flag);
-
 	return 0;
 }
 
-- 
2.43.0







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