===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/patch/inp.c,v
retrieving revision 1.35
retrieving revision 1.36
diff -u -r1.35 -r1.36
--- src/usr.bin/patch/inp.c	2009/10/27 23:59:41	1.35
+++ src/usr.bin/patch/inp.c	2012/04/10 14:46:34	1.36
@@ -1,4 +1,4 @@
-/*	$OpenBSD: inp.c,v 1.35 2009/10/27 23:59:41 deraadt Exp $	*/
+/*	$OpenBSD: inp.c,v 1.36 2012/04/10 14:46:34 ajacoutot Exp $	*/
 
 /*
  * patch - a program to apply diffs to original files
@@ -243,12 +243,16 @@
 	if ((ifd = open(filename, O_RDONLY)) < 0)
 		pfatal("can't open file %s", filename);
 
-	i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
-	if (i_womp == MAP_FAILED) {
-		perror("mmap failed");
+	if (i_size) {
+		i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
+		if (i_womp == MAP_FAILED) {
+			perror("mmap failed");
+			i_womp = NULL;
+			close(ifd);
+			return false;
+		}
+	} else {
 		i_womp = NULL;
-		close(ifd);
-		return false;
 	}
 
 	close(ifd);