From 88b67575f9457312d0277e16dc06103be3a31965 Mon Sep 17 00:00:00 2001
From: Daniel-Constantin Mierla <miconda@gmail.com>
Date: Thu, 14 May 2015 13:40:11 +0200
Subject: [PATCH] tm: safety check not to allocate 0 bytes in rpc command

---
 modules/tm/rpc_uac.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/tm/rpc_uac.c b/modules/tm/rpc_uac.c
index 14c02f01619..d223fd2945c 100644
--- a/modules/tm/rpc_uac.c
+++ b/modules/tm/rpc_uac.c
@@ -211,7 +211,12 @@ static char *get_hfblock(str *uri, struct hdr_field *hf, int proto,
 		DBG("get_hfblock: one more hf processed\n");
 	} /* header loop */
 	
-	     /* construct a single header block now */
+	if(total_len==0) {
+		LM_DBG("empty result for headers block\n");
+		goto error;
+	}
+
+	/* construct a single header block now */
 	ret = pkg_malloc(total_len);
 	if (!ret) {
 		LOG(L_ERR, "get_hfblock: no pkg mem for hf block\n");