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From: Jaroslav Kysela <>
To: ALSA development <>
Cc: Takashi Iwai <>
Subject: [PATCH] alsa: control_led - fix initialization in the mode show callback
Date: Mon, 14 Jun 2021 09:17:10 +0200
Message-ID: <> (raw)

The str variable should be always initialized before use even if
the switch covers all cases. This is a minimalistic fix: Assign NULL,
the sprintf() may print '(null)' if something is corrupted.

Signed-off-by: Jaroslav Kysela <>
 sound/core/control_led.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index 861f71f2fab5..764058cc345d 100644
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -397,7 +397,7 @@ static ssize_t mode_show(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
-	const char *str;
+	const char *str = NULL;
 	switch (led->mode) {
 	case MODE_FOLLOW_MUTE:	str = "follow-mute"; break;

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14  7:17 Jaroslav Kysela [this message]
2021-06-14  7:52 ` Takashi Iwai

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