From f5f2c36d98a6bfeb41363e38f1a34036264d1036 Mon Sep 17 00:00:00 2001
From: Allen Byrne <byrn@hdfgroup.org>
Date: Fri, 29 Dec 2017 09:05:30 -0600
Subject: HDFFV-9724 prefix of 0 length should be null value

---
 src/H5Dvirtual.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/H5Dvirtual.c b/src/H5Dvirtual.c
index 8d861c9..24623e4 100644
--- a/src/H5Dvirtual.c
+++ b/src/H5Dvirtual.c
@@ -898,7 +898,7 @@ H5D__virtual_open_file(hid_t plist_id, const H5F_t *vdset_file,
         H5E_BEGIN_TRY {
             size = H5Pget_virtual_prefix(plist_id, NULL, 0);
         } H5E_END_TRY;
-        if(size < 0)
+        if(size <= 0)
             my_prefix = NULL;
         else {
             /* Allocate a buffer to hold the filename + prefix + possibly the delimiter + terminating null byte */
-- 
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