commit 74e7072f63b2f04cb65b64abfe5ca49695f0166e
author Oliver Smith <osmith@sysmocom.de> Mon Jan 13 15:51:56 2020 +0100
committer laforge <laforge@osmocom.org> Fri Jan 31 15:27:50 2020 +0000
tree e2afe920c6890341f54b3b457435753d5ba167d9
parent 4fa9653733561828551a7aa8c1f9c19f093dadf4

mdns_rfc.c: fix possible access of uninit. mem

Fixes: CID#207548
Change-Id: Ifa269d8a88d84c01349668cdd8d1f1d24c12c6d8

src/mslookup/mdns_rfc.c

diff --git a/src/mslookup/mdns_rfc.c b/src/mslookup/mdns_rfc.c
index e1fc184..6f39a8e 100644
--- a/src/mslookup/mdns_rfc.c
+++ b/src/mslookup/mdns_rfc.c
@@ -83,7 +83,12 @@
 		return NULL;
 
 	while (*qname) {
-		size_t len = *qname;
+		size_t len;
+
+		if (i >= qname_max_len)
+			return NULL;
+
+		len = *qname;
 		next_label = qname + len + 1;
 
 		if (next_label >= qname_end || i + len > OSMO_MDNS_RFC_MAX_NAME_LEN)