From cfc23bfc4445f635ab73eec2b113dc1f8b174430 Mon Sep 17 00:00:00 2001
From: Nishant Bansal <nishant.bansal.282003@gmail.com>
Date: Fri, 25 Oct 2024 22:58:18 +0530
Subject: [PATCH] Improve Resource Cleanup on Fatal Errors

Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com>
---
 vector/v.info/print.c | 36 +++++++++++++++++++++++++++---------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/vector/v.info/print.c b/vector/v.info/print.c
index 3d0fe42e9f..5d00f2d120 100644
--- a/vector/v.info/print.c
+++ b/vector/v.info/print.c
@@ -189,6 +189,7 @@ void print_columns(struct Map_info *Map, const char *input_opt,
     num_dblinks = Vect_get_num_dblinks(Map);
 
     if (num_dblinks <= 0) {
+        Vect_close(&Map);
         G_fatal_error(
             _("Database connection for map <%s> is not defined in DB file"),
             input_opt);
@@ -198,30 +199,43 @@ void print_columns(struct Map_info *Map, const char *input_opt,
                 "layer <%s>:"),
               field_opt);
 
-    if ((fi = Vect_get_field2(Map, field_opt)) == NULL)
+    if ((fi = Vect_get_field2(Map, field_opt)) == NULL) {
+        Vect_close(&Map);
         G_fatal_error(
             _("Database connection not defined for layer <%s> of <%s>"),
             field_opt, input_opt);
+    }
     driver = db_start_driver(fi->driver);
-    if (driver == NULL)
+    if (driver == NULL) {
+        Vect_close(&Map);
         G_fatal_error(_("Unable to open driver <%s>"), fi->driver);
+    }
     db_init_handle(&handle);
     db_set_handle(&handle, fi->database, NULL);
-    if (db_open_database(driver, &handle) != DB_OK)
+    if (db_open_database(driver, &handle) != DB_OK) {
+        db_shutdown_driver(driver);
+        Vect_close(&Map);
         G_fatal_error(_("Unable to open database <%s> by driver <%s>"),
                       fi->database, fi->driver);
+    }
     db_init_string(&table_name);
     db_set_string(&table_name, fi->table);
-    if (db_describe_table(driver, &table_name, &table) != DB_OK)
+    if (db_describe_table(driver, &table_name, &table) != DB_OK) {
+        db_close_database(driver);
+        db_shutdown_driver(driver);
+        Vect_close(&Map);
         G_fatal_error(_("Unable to describe table <%s>"), fi->table);
+    }
 
-    JSON_Value *root_value = json_value_init_object();
-    JSON_Object *root_object = json_object(root_value);
-
-    JSON_Value *columns_value = json_value_init_array();
-    JSON_Array *columns_array = json_array(columns_value);
+    JSON_Value *root_value = NULL, *columns_value = NULL;
+    JSON_Object *root_object = NULL;
+    JSON_Array *columns_array = NULL;
 
     if (format == JSON) {
+        root_value = json_value_init_object();
+        root_object = json_object(root_value);
+        columns_value = json_value_init_array();
+        columns_array = json_array(columns_value);
         json_object_set_value(root_object, "columns", columns_value);
     }
 
@@ -260,6 +274,10 @@ void print_columns(struct Map_info *Map, const char *input_opt,
         char *serialized_string = NULL;
         serialized_string = json_serialize_to_string_pretty(root_value);
         if (serialized_string == NULL) {
+            json_value_free(root_value);
+            db_close_database(driver);
+            db_shutdown_driver(driver);
+            Vect_close(&Map);
             G_fatal_error(_("Failed to initialize pretty JSON string."));
         }
         puts(serialized_string);