From 847ddc1e2c4e869170c8aa86af974388122573bb Mon Sep 17 00:00:00 2001
From: Russell Bryant <russell@russellbryant.com>
Date: Sun, 24 Dec 2006 07:23:07 +0000
Subject: [PATCH] Check for the proper return value on an error in a call to
 mmap(). This was reported by Andy Wang on the asterisk-dev list.  Thanks!

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@48943 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 channels/chan_iax2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index e896abeb3e..1adac13e27 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -1260,7 +1260,7 @@ static int try_firmware(char *s)
 		return -1;
 	}
 	fwh = mmap(NULL, stbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0); 
-	if (!fwh) {
+	if (fwh == (void *) -1) {
 		ast_log(LOG_WARNING, "mmap failed: %s\n", strerror(errno));
 		close(fd);
 		return -1;