From: Jaroslav Kysela <perex@perex.cz>
Date: Fri, 16 Apr 2021 08:48:35 +0000 (+0200)
Subject: ucm: find-device / pcm - the ctl_list may be empty
X-Git-Tag: v1.2.5~41
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=ddb0871ec61b61f2f1a401165e6bd31043892fd5;p=alsa-lib.git

ucm: find-device / pcm - the ctl_list may be empty

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/src/ucm/ucm_subs.c b/src/ucm/ucm_subs.c
index 5cffcf8f..c9023460 100644
--- a/src/ucm/ucm_subs.c
+++ b/src/ucm/ucm_subs.c
@@ -467,6 +467,10 @@ static int rval_device_lookup_init(snd_use_case_mgr_t *uc_mgr,
 
 	if (snd_config_search(config, "ctl", &d) || snd_config_get_string(d, &s)) {
 		iter->ctl_list = uc_mgr_get_master_ctl(uc_mgr);
+		if (iter->ctl_list == NULL) {
+			uc_error("Control device is not defined!");
+			return -EINVAL;
+		}
 	} else {
 		err = uc_mgr_open_ctl(uc_mgr, &iter->ctl_list, s, 1);
 		if (err < 0) {