From: Mengdong Lin <mengdong.lin@linux.intel.com>
Date: Thu, 3 Nov 2016 23:08:27 +0000 (+0800)
Subject: topology: tplg_elem_lookup() checks parameter before searching
X-Git-Tag: v1.1.3~41
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=d170e1ffa17e55d3e58c1be45d3493b8d2e9e633;p=alsa-lib.git

topology: tplg_elem_lookup() checks parameter before searching

Check the parameters at first in case of misuse.

Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/src/topology/elem.c b/src/topology/elem.c
index 029c9abf..724bf262 100644
--- a/src/topology/elem.c
+++ b/src/topology/elem.c
@@ -111,6 +111,9 @@ struct tplg_elem *tplg_elem_lookup(struct list_head *base, const char* id,
 	struct list_head *pos;
 	struct tplg_elem *elem;
 
+	if (!base || !id)
+		return NULL;
+
 	list_for_each(pos, base) {
 
 		elem = list_entry(pos, struct tplg_elem, list);