Fix creation of zero-sized disk storage objects.

We must not call write_all() with a zero length parameter.

diff --git a/util.c b/util.c
index 49f1914e81e59a2648a9cb9af364ad1d98ac58cd..572b7a52a4829489c84b1f9d94ead3dab910ae60 100644 (file)
--- a/util.c
+++ b/util.c
@@ -110,9 +110,11 @@ int write_file(const char *filename, const void *buf, size_t size)
        if (ret < 0)
                return ret;
        fd = ret;
-       ret = write_all(fd, buf, &size);
-       if (ret < 0)
-               goto out;
+       if (size != 0) {
+               ret = write_all(fd, buf, &size);
+               if (ret < 0)
+                       goto out;
+       }
        ret = 1;
 out:
        close(fd);