MT#63079 Add check for avp name initialization

This patch check if the name passed to $avp was correctly initialized.
If not initialized it will print an error message and return 0 (no match).

Change-Id: Icc84f0ff1103eb759b2282bd76951a8410225910

debian/patches/series

@@ -64,3 +64,4 @@ sipwise/permissions-don-t-allow-reloads-in-the-middle-of-ong.patch
 ## git checkout -- debian/
 ### git commit + git-review as usual
 ###
+sipwise/add_check_avp_name.patch

debian/patches/sipwise/add_check_avp_name.patch

@@ -0,0 +1,13 @@
+--- a/src/core/usr_avp.c
++++ b/src/core/usr_avp.c
+@@ -391,6 +391,10 @@ static inline int match_by_id(avp_t *avp
+ static inline int match_by_name(avp_t *avp, avp_id_t id, str *name)
+ {
+ 	str *avp_name;
++	if (!name || !name->s || name->len <= 0) {
++		LM_ERR("Invalid AVP name pointer\n");
++		return 0;
++	}
+ 	if(id == avp->id && avp->flags & AVP_NAME_STR
+ 			&& (avp_name = get_avp_name(avp)) != 0 && avp_name->len == name->len
+ 			&& !strncasecmp(avp_name->s, name->s, name->len)) {