From b375d439fffdc6985be67b9ca6cdf4d072c704b1 Mon Sep 17 00:00:00 2001
From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Tue, 7 Oct 2008 15:37:34 +0000
Subject: [PATCH] aniel 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/trunk/program@1584 a5681a0c-68f1-0310-ab6d-d61299d08faa
---
 src/rrd_open.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/rrd_open.c b/src/rrd_open.c
index 2796506..f262413 100644
--- a/src/rrd_open.c
+++ b/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
-- 
2.11.0