From 61ade8b943ecad8a082a0696377721c2ed879d86 Mon Sep 17 00:00:00 2001
From: cloudwalk <cloudwalk@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Wed, 15 Jul 2020 13:55:20 +0000
Subject: [PATCH] zone: Fix backed file alloc for BSD. Check for -1 in addition
 to NULL on mmap data (David CARLIER)

https://gitlab.com/xonotic/darkplaces/-/merge_requests/55

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12815 d7cf8633-e32d-0410-b094-e92efae38249
---
 zone.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/zone.c b/zone.c
index 69d053d8..e2ec8ca7 100644
--- a/zone.c
+++ b/zone.c
@@ -107,6 +107,9 @@ void Mem_PrintList(size_t minallocationsize);
 #if FILE_BACKED_MALLOC
 #include <stdlib.h>
 #include <sys/mman.h>
+#ifndef MAP_NORESERVE
+#define MAP_NORESERVE 0
+#endif
 typedef struct mmap_data_s
 {
 	size_t len;
@@ -127,7 +130,7 @@ static void *mmap_malloc(size_t size)
 	data = (unsigned char *) mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERVE, fd, 0);
 	close(fd);
 	unlink(vabuf);
-	if(!data)
+	if(!data || data == (void *)-1)
 		return NULL;
 	data->len = size;
 	return (void *) (data + 1);
-- 
2.39.2