[sr-dev] git:master:db3b9dbd: tm: crash on memcpy fix

[Roman Romanchenko]

Module: kamailio
Branch: master
Commit: db3b9dbd48f7bb74abf08b0e97bcac15015df719
URL: https://github.com/kamailio/kamailio/commit/db3b9dbd48f7bb74abf08b0e97bcac15015df719

Author: Roman Romanchenko <rromanchenko at sipwise.com>
Committer: Roman Romanchenko <rromanchenko at sipwise.com>
Date: 2018-08-31T12:02:43+03:00

tm: crash on memcpy fix

- in some cases tag is not initialized and lead to crash.
  Memory pointer check before writing to added.

---

Modified: src/modules/tm/t_reply.c

---

Diff:  https://github.com/kamailio/kamailio/commit/db3b9dbd48f7bb74abf08b0e97bcac15015df719.diff
Patch: https://github.com/kamailio/kamailio/commit/db3b9dbd48f7bb74abf08b0e97bcac15015df719.patch

---

diff --git a/src/modules/tm/t_reply.c b/src/modules/tm/t_reply.c
index 474851aa7c..f53625e833 100644
--- a/src/modules/tm/t_reply.c
+++ b/src/modules/tm/t_reply.c
@@ -299,6 +299,7 @@ inline static int update_totag_set(struct cell *t, struct sip_msg *ok)
 
 	for (i=t->fwded_totags; i; i=i->next) {
 		if (i->tag.len==tag->len
+				&& i->tag.s
 				&& memcmp(i->tag.s, tag->s, tag->len) ==0 ){
 			/* to tag already recorded */
 			LM_DBG("to-tag retransmission\n");