From 9c5af90faeb872e85cb5db980010b0e6859aea37 Mon Sep 17 00:00:00 2001
From: Juan RP <xtraeme@gmail.com>
Date: Tue, 7 Oct 2014 10:23:02 +0200
Subject: [PATCH] lib/portableproplib/prop_object.c: CID 62703 (argument cannot
 be negative)

---
 lib/portableproplib/prop_object.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/portableproplib/prop_object.c b/lib/portableproplib/prop_object.c
index 181d3f5b..dfa60fe5 100644
--- a/lib/portableproplib/prop_object.c
+++ b/lib/portableproplib/prop_object.c
@@ -903,11 +903,17 @@ _prop_object_internalize_map_file(const char *fname)
 {
 	struct stat sb;
 	struct _prop_object_internalize_mapped_file *mf;
-	size_t pgsize = (size_t)sysconf(_SC_PAGESIZE);
-	size_t pgmask = pgsize - 1;
+	long scps = sysconf(_SC_PAGESIZE);
+	size_t pgsize, pgmask;
 	bool need_guard = false;
 	int fd;
 
+	if (scps == -1)
+		return NULL;
+
+	pgsize = (size_t)scps;
+	pgmask = pgsize -1;
+
 	mf = _PROP_MALLOC(sizeof(*mf), M_TEMP);
 	if (mf == NULL)
 		return (NULL);