From d9882395e2ceb0274e15a3ba80df900d1e527c0d Mon Sep 17 00:00:00 2001
From: Peter Griess <pg@std.in>
Date: Tue, 4 May 2010 11:26:23 -0500
Subject: [PATCH] Fix SEGV by setting msg_controllen earlier.

- Some implementations of CMSG_FIRSTHDR() rely on msg_controllen being
  set correctly, else it returns NULL: see <linux/socket.h>.
---
 src/node_net2.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/node_net2.cc b/src/node_net2.cc
index 2958e03234..865bf7c506 100644
--- a/src/node_net2.cc
+++ b/src/node_net2.cc
@@ -671,12 +671,12 @@ static Handle<Value> SendFD(const Arguments& args) {
   msg.msg_namelen = 0;
   msg.msg_flags = 0;
   msg.msg_control = (void *) control_msg;
+  msg.msg_controllen = CMSG_LEN(sizeof(fd_to_send));
   cmsg = CMSG_FIRSTHDR(&msg);
   cmsg->cmsg_level = SOL_SOCKET;
   cmsg->cmsg_type = SCM_RIGHTS;
-  cmsg->cmsg_len = CMSG_LEN(sizeof(fd_to_send));
+  cmsg->cmsg_len = msg.msg_controllen;
   *(int*) CMSG_DATA(cmsg) = fd_to_send;
-  msg.msg_controllen = cmsg->cmsg_len;
 
   ssize_t written = sendmsg(fd, &msg, 0);