json BUGFIX opaq node cannot have an empty name

Author: lePici

src/parser_json.c

@@ -1217,6 +1217,13 @@ lydjson_subtree_r(struct lyd_json_ctx *lydctx, struct lyd_node *parent, struct l
         /* parse as an opaq node */
         assert((lydctx->parse_opts & LYD_PARSE_OPAQ) || (lydctx->int_opts));
 
+        /* opaq node cannot have an empty string as the name. */
+        if (name_len == 0) {
+            LOGVAL(lydctx->jsonctx->ctx, LYVE_SYNTAX_JSON, "A JSON object member name cannot be a zero-length string.");
+            ret = LY_EVALID;
+            goto cleanup;
+        }
+
         /* move to the second item in the name/X pair */
         ret = lyjson_ctx_next(lydctx->jsonctx, &status);
         LY_CHECK_GOTO(ret, cleanup);

tests/utests/data/test_parser_json.c

@@ -414,6 +414,10 @@ test_opaq(void **state)
     CHECK_LYD_NODE_OPAQ((struct lyd_node_opaq *)tree, 0, 0x1, LY_VALUE_JSON, "l1", 0, 0, NULL,  0,  "");
     CHECK_LYD_STRING(tree, LYD_PRINT_SHRINK | LYD_PRINT_WITHSIBLINGS, data);
     lyd_free_all(tree);
+
+    /* empty name */
+    PARSER_CHECK_ERROR("{\"@a:foo\":{\"\":0}}", 0, LYD_VALIDATE_PRESENT, tree, LY_EVALID,
+            "A JSON object member name cannot be a zero-length string.", "Line number 1.");
 }
 
 static void