From 160e58b67d28967bc7b1800835a082bcd7052d82 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Mon, 16 Jul 2012 15:34:18 -0400
Subject: [PATCH] Win32: avoid crash when waiting forever on zero fds.

---
 win32select.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/win32select.c b/win32select.c
index 46c32c34..fbd27a43 100644
--- a/win32select.c
+++ b/win32select.c
@@ -298,7 +298,7 @@ win32_dispatch(struct event_base *base, struct timeval *tv)
 	    win32op->readset_out->fd_count : win32op->writeset_out->fd_count;
 
 	if (!fd_count) {
-		long msec = evutil_tv_to_msec(tv);
+		long msec = tv ? evutil_tv_to_msec(tv) : LONG_MAX;
 		/* Sleep's DWORD argument is unsigned long */
 		if (msec < 0)
 			msec = LONG_MAX;