From 0a187bdd4162d605c3d5791a174a4e5152dcf8bb Mon Sep 17 00:00:00 2001
From: Tim Bateman <tim.bateman@gmail.com>
Date: Tue, 3 Dec 2013 10:46:32 -0500
Subject: [PATCH] Fixed one byte stack overflow in mcast recvfrom.

The actual overflow happens when enforcing the NULL termination shortly
after the recvfrom.
---
 api.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api.c b/api.c
index 9c0cdc9f..24f1e6f9 100644
--- a/api.c
+++ b/api.c
@@ -3564,7 +3564,7 @@ static void mcast()
 
 		count++;
 		came_from_siz = sizeof(came_from);
-		if (SOCKETFAIL(rep = recvfrom(mcast_sock, buf, sizeof(buf),
+		if (SOCKETFAIL(rep = recvfrom(mcast_sock, buf, sizeof(buf) - 1,
 						0, (struct sockaddr *)(&came_from), &came_from_siz))) {
 			applog(LOG_DEBUG, "API mcast failed count=%d (%s) (%d)",
 					count, SOCKERRMSG, (int)mcast_sock);