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ALSA: control led - improve the set_led_id() parser 

It may be possible that the string pointer does not move
when parsing. Add a code which detects this state and
simply break the parser loop in this case.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210331180725.663623-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jaroslav Kysela 2021-03-31 20:07:25 +02:00 committed by Takashi Iwai
parent 016c20506d
commit 62327ebbdf
1 changed files with 4 additions and 1 deletions
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5
sound/core/control_led.c
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@ -506,7 +506,7 @@ static char *parse_iface(char *s, unsigned int *val)
static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, size_t count,
bool attach)
{
char buf2[256], *s;
char buf2[256], *s, *os;
size_t len = max(sizeof(s) - 1, count);
struct snd_ctl_elem_id id;
int err;
@ -517,6 +517,7 @@ static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, si
id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
s = buf2;
while (*s) {
os = s;
if (!strncasecmp(s, "numid=", 6)) {
s = parse_uint(s + 6, &id.numid);
} else if (!strncasecmp(s, "iface=", 6)) {
@ -546,6 +547,8 @@ static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, si
}
if (*s == ',')
s++;
if (s == os)
break;
}
err = snd_ctl_led_set_id(led_card->number, &id, led_card->led->group, attach);