write_redis: fix build warning

src/write_redis.c: In function ‘wr_config’:
src/write_redis.c:222:53: warning: ‘%s’ directive output may be truncated writing up to 127 bytes into a region of size 116 [-Wformat-truncation=]
     snprintf(cb_name, sizeof(cb_name), "write_redis/%s", node->name);
                                                     ^~
src/write_redis.c:222:5: note: ‘snprintf’ output between 13 and 140 bytes into a destination of size 128
     snprintf(cb_name, sizeof(cb_name), "write_redis/%s", node->name);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

diff --git a/src/write_redis.c b/src/write_redis.c
index 7d383f9..7be236a 100644 (file)
--- a/src/write_redis.c
+++ b/src/write_redis.c
@@ -217,7 +217,7 @@ static int wr_config_node(oconfig_item_t *ci) /* {{{ */
   } /* for (i = 0; i < ci->children_num; i++) */
 
   if (status == 0) {
-    char cb_name[DATA_MAX_NAME_LEN];
+    char cb_name[sizeof("write_redis/") + DATA_MAX_NAME_LEN];
 
     snprintf(cb_name, sizeof(cb_name), "write_redis/%s", node->name);