From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Wed, 30 Jun 2010 12:48:47 +0000 (+0000)
Subject: src/rrd_client.c: Fix a potential segmentation fault in "get_path".
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=b47c2e44707f965100a561660a45f89b5759cbc1;p=rrdtool.git

src/rrd_client.c: Fix a potential segmentation fault in "get_path".

The "get_path" function is called at least from "rrdc_update" without
checking for a connection first. In that case the "sd_path" pointer may be
NULL, so dereferencing it without checking for NULL is not good behavior.

This patch checks all arguments of the "get_path" function and returns an
error if any pointer is NULL. -- Florian Forster



git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@2094 a5681a0c-68f1-0310-ab6d-d61299d08faa
---

diff --git a/src/rrd_client.c b/src/rrd_client.c
index d292281..0d21283 100644
--- a/src/rrd_client.c
+++ b/src/rrd_client.c
@@ -73,6 +73,9 @@ static const char *get_path (const char *path, char *resolved_path) /* {{{ */
   const char *ret = path;
   int is_unix = 0;
 
+  if ((path == NULL) || (resolved_path == NULL) || (sd_path == NULL))
+    return (NULL);
+
   if ((*sd_path == '/')
       || (strncmp ("unix:", sd_path, strlen ("unix:")) == 0))
     is_unix = 1;