Daniel Pocock reported that the argument may be NULL in low-diskspace

situations, so check for that here to prevent a segmentation fault.
-- Florian Forster

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.3@1585 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_open.c b/program/src/rrd_open.c
index c4ee3c0a0727f2dc8000602c8e572744fab0f529..06afabe12540400a1635e190f0b3b04e73f64665 100644 (file)
--- a/program/src/rrd_open.c
+++ b/program/src/rrd_open.c
@@ -364,6 +364,13 @@ void rrd_dontneed(
     unsigned long i;
     ssize_t   _page_size = sysconf(_SC_PAGESIZE);
 
+    if (rrd_file == NULL) {
+#if defined DEBUG && DEBUG
+           fprintf (stderr, "rrd_dontneed: Argument 'rrd_file' is NULL.\n");
+#endif
+           return;
+    }
+
 #if defined DEBUG && DEBUG > 1
     mincore_print(rrd_file, "before");
 #endif