[alsa-devel] [PATCH 6/6] topology: tplg_elem_lookup() checks parameter before searching

[mengdong.lin at linux.intel.com]

From: Mengdong Lin <mengdong.lin at linux.intel.com>

Check the parameters at first in case of misuse.

Signed-off-by: Mengdong Lin <mengdong.lin at linux.intel.com>

diff --git a/src/topology/elem.c b/src/topology/elem.c
index 029c9ab..724bf26 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);
-- 
2.7.4