ALSA: control_led - fix initialization in the mode show callback

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 <perex@perex.cz>
Link: https://lore.kernel.org/r/20210614071710.1786866-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index 861f71f2fab54537739a4485b8ce73d9fadf4221..764058cc345d120ae943b785dee3c5fa9da2ec44 100644 (file)
--- 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;