leds: pattern trigger -- check pattern for validity

Don't allow invalid brightness in the pattern.

Signed-off-by: Pavel Machek <[e-mail]>

drivers/leds/trigger/ledtrig-pattern.c

···
 
 	while (offset < count - 1 && data->npatterns < MAX_PATTERNS) {
 		cr = 0;
-		ccount = sscanf(buf + offset, "%d %u %n",
+		ccount = sscanf(buf + offset, "%u %u %n",
 				&data->patterns[data->npatterns].brightness,
 				&data->patterns[data->npatterns].delta_t, &cr);
-		if (ccount != 2) {
+
+		if (ccount != 2 ||
+		    data->patterns[data->npatterns].brightness > data->led_cdev->max_brightness) {
 			data->npatterns = 0;
 			return -EINVAL;
 		}