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ALSA: control-led: use strscpy in set_led_id() 

commit 70051cffb3 upstream.

The use of strncpy() in the set_led_id() was incorrect.
The len variable should use 'min(sizeof(buf2) - 1, count)'
expression.

Use strscpy() function to simplify things and handle the error gracefully.

Fixes: a135dfb5de ("ALSA: led control - add sysfs kcontrol LED marking layer")
Reported-by: yang.yang29@zte.com.cn
Link: https://lore.kernel.org/alsa-devel/202301091945513559977@zte.com.cn/
Cc: <stable@vger.kernel.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jaroslav Kysela 2023-01-09 16:12:49 +01:00 committed by Greg Kroah-Hartman
parent 303a04b656
commit e59e115d67
1 changed files with 2 additions and 3 deletions
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5
sound/core/control_led.c
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@ -530,12 +530,11 @@ static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, si
bool attach)
{
char buf2[256], *s, *os;
size_t len = max(sizeof(s) - 1, count);
struct snd_ctl_elem_id id;
int err;
strncpy(buf2, buf, len);
buf2[len] = '\0';
if (strscpy(buf2, buf, sizeof(buf2)) < 0)
return -E2BIG;
memset(&id, 0, sizeof(id));
id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
s = buf2;