[PATCH 5.13 102/351] ALSA: control_led - fix initialization in the mode show callback

Greg Kroah-Hartman
2021-07-19T17:24:07Z

From: Jaroslav Kysela <perex@perex.cz>

[ Upstream commit e381a14c3e3a4e90e293d4eaa5a3ab8ae98b9973 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 a90e31dbde61..ff7fd5e29551 100644
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -397,7 +397,7 @@ static ssize_t show_mode(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;
--
2.30.2