libxl: fix off-by-one error in JSON parser

We need a sentinel slot in the generated libxl_key_value_list.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/tools/libxl/libxl_json.c b/tools/libxl/libxl_json.c
index ceb014a32392f83a6f4f143999469a0e1b609468..98335b05b246ec3287f79d748bd87d9b16abf966 100644 (file)
--- a/tools/libxl/libxl_json.c
+++ b/tools/libxl/libxl_json.c
@@ -247,7 +247,7 @@ int libxl__key_value_list_parse_json(libxl__gc *gc, const libxl__json_object *o,
 
     maps = libxl__json_object_get_map(o);
     size = maps->count * 2;
-    kvl = *p = libxl__calloc(NOGC, size, sizeof(char *));
+    kvl = *p = libxl__calloc(NOGC, size+1, sizeof(char *));
 
     for (i = 0; i < maps->count; i++) {
         int idx = i * 2;