Merge branch 'fix/return_esp_err_t_for_httpd_req_get_url_query_str_v5.4' into 'release/v5.4'

feat(https_server): Added checks to verify if uri is empty (v5.4)

See merge request espressif/esp-idf!36286

Author: mahavirj

components/esp_http_server/include/esp_http_server.h

@@ -964,7 +964,7 @@ esp_err_t httpd_req_get_hdr_value_str(httpd_req_t *r, const char *field, char *v
  *
  * @return
  *  - Length    : Query is found in the request URL
- *  - Zero      : Query not found / Null arguments / Invalid request
+ *  - Zero      : Query not found / Null arguments / Invalid request / uri is empty
  */
 size_t httpd_req_get_url_query_len(httpd_req_t *r);
 
@@ -992,6 +992,7 @@ size_t httpd_req_get_url_query_len(httpd_req_t *r);
  *
  * @return
  *  - ESP_OK : Query is found in the request URL and copied to buffer
+ *  - ESP_FAIL                   : uri is empty
  *  - ESP_ERR_NOT_FOUND          : Query not found
  *  - ESP_ERR_INVALID_ARG        : Null arguments
  *  - ESP_ERR_HTTPD_INVALID_REQ  : Invalid HTTP request pointer

components/esp_http_server/src/httpd_parse.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2018-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2018-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -916,6 +916,11 @@ size_t httpd_req_get_url_query_len(httpd_req_t *r)
         return 0;
     }
 
+    if (r->uri[0] == '\0') {
+        ESP_LOGD(TAG, "uri is empty");
+        return 0;
+    }
+
     struct httpd_req_aux   *ra  = r->aux;
     struct http_parser_url *res = &ra->url_parse_res;
 
@@ -936,6 +941,11 @@ esp_err_t httpd_req_get_url_query_str(httpd_req_t *r, char *buf, size_t buf_len)
         return ESP_ERR_HTTPD_INVALID_REQ;
     }
 
+    if (r->uri[0] == '\0') {
+        ESP_LOGD(TAG, "uri is empty");
+        return ESP_FAIL;
+    }
+
     struct httpd_req_aux   *ra  = r->aux;
     struct http_parser_url *res = &ra->url_parse_res;