src/rrd_graph_helper.c: fix Coverity CID#32401 Buffer not null terminated

        CWE-170 / https://cwe.mitre.org/data/definitions/170.html

diff --git a/src/rrd_graph_helper.c b/src/rrd_graph_helper.c
index d58bc938f5e0155c29049b7d4670d17365812e1d..0415af79ebd1c14f724639ccf1de04fdd2bda2d9 100644 (file)
--- a/src/rrd_graph_helper.c
+++ b/src/rrd_graph_helper.c
@@ -935,7 +935,7 @@ int parse_def(enum gf_en gf,parsedargs_t*pa,image_desc_t *const im){
 
          /* and keep a copy of the error */
          char original_error[4096];
-         strncpy(original_error,rrd_get_error(),sizeof(original_error));
+         strncpy(original_error,rrd_get_error(),sizeof(original_error) - 1);
          /* and clear the error */
          rrd_clear_error();