--- xen-3.2-testing.hg/tools/ioemu/hw/xenfb.c.orig	2008-09-26 11:16:55.000000000 +0200
+++ xen-3.2-testing.hg/tools/ioemu/hw/xenfb.c	2008-09-26 11:18:01.000000000 +0200
@@ -496,7 +496,7 @@
 			depth);
 		return -1;
 	}
-	if (row_stride < 0 || row_stride > fb_len) {
+	if (row_stride <= 0 || row_stride > fb_len) {
 		fprintf(stderr,
 			"FB: invalid frontend stride %d\n", row_stride);
 		return -1;