diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1bbf2b8d139..54eadaef98f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,13 @@
+2017-09-22  Sergio Durigan Junior  <sergiodj@redhat.com>
+
+	* cli/cli-cmds.c (pwd_command): Use "getcwd (NULL, 0)".
+	(cd_command): Likewise.  Free "current_directory" before
+	assigning to it.
+	* main.c (captured_main_1): Use "getcwd (NULL, 0)".
+	* mi/mi-cmd-env.c (mi_cmd_env_pwd): Likewise.
+	* top.c (gdb_dirbuf): Remove global declaration.
+	* top.h (gdb_dirbuf): Likewise.
+
 2017-09-22  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	* gnulib/aclocal.m4: Regenerate.
diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index 260fd3f6353..cbafb13837f 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -384,13 +384,16 @@ pwd_command (char *args, int from_tty)
 {
   if (args)
     error (_("The \"pwd\" command does not take an argument: %s"), args);
-  if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))
+
+  gdb::unique_xmalloc_ptr<char> cwd (getcwd (NULL, 0));
+
+  if (cwd == NULL)
     error (_("Error finding name of working directory: %s"),
            safe_strerror (errno));
 
-  if (strcmp (gdb_dirbuf, current_directory) != 0)
+  if (strcmp (cwd.get (), current_directory) != 0)
     printf_unfiltered (_("Working directory %s\n (canonically %s).\n"),
-		       current_directory, gdb_dirbuf);
+		       current_directory, cwd.get ());
   else
     printf_unfiltered (_("Working directory %s.\n"), current_directory);
 }
@@ -418,7 +421,8 @@ cd_command (char *dir, int from_tty)
   /* There's too much mess with DOSish names like "d:", "d:.",
      "d:./foo" etc.  Instead of having lots of special #ifdef'ed code,
      simply get the canonicalized name of the current directory.  */
-  dir = getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
+  gdb::unique_xmalloc_ptr<char> cwd (getcwd (NULL, 0));
+  dir = cwd.get ();
 #endif
 
   len = strlen (dir);
@@ -436,7 +440,10 @@ cd_command (char *dir, int from_tty)
 
   dir_holder.reset (savestring (dir, len));
   if (IS_ABSOLUTE_PATH (dir_holder.get ()))
-    current_directory = dir_holder.release ();
+    {
+      xfree (current_directory);
+      current_directory = dir_holder.release ();
+    }
   else
     {
       if (IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1]))
diff --git a/gdb/main.c b/gdb/main.c
index fe80511243b..66ba75ba210 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -549,11 +549,10 @@ captured_main_1 (struct captured_main_args *context)
     (xstrprintf ("%s: warning: ", gdb_program_name));
   warning_pre_print = tmp_warn_preprint.get ();
 
-  if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))
+  current_directory = getcwd (NULL, 0);
+  if (current_directory == NULL)
     perror_warning_with_name (_("error finding working directory"));
 
-  current_directory = gdb_dirbuf;
-
   /* Set the sysroot path.  */
   gdb_sysroot = relocate_gdb_directory (TARGET_SYSTEM_ROOT,
 					TARGET_SYSTEM_ROOT_RELOCATABLE);
diff --git a/gdb/mi/mi-cmd-env.c b/gdb/mi/mi-cmd-env.c
index 977b6e274da..0d08bb89a93 100644
--- a/gdb/mi/mi-cmd-env.c
+++ b/gdb/mi/mi-cmd-env.c
@@ -74,11 +74,12 @@ mi_cmd_env_pwd (const char *command, char **argv, int argc)
      
   /* Otherwise the mi level is 2 or higher.  */
 
-  if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))
+  gdb::unique_xmalloc_ptr<char> cwd (getcwd (NULL, 0));
+  if (cwd == NULL)
     error (_("-environment-pwd: error finding name of working directory: %s"),
            safe_strerror (errno));
-    
-  uiout->field_string ("cwd", gdb_dirbuf);
+
+  uiout->field_string ("cwd", cwd.get ());
 }
 
 /* Change working directory.  */
diff --git a/gdb/top.c b/gdb/top.c
index 404e096755c..c89e78f2439 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -133,9 +133,6 @@ show_confirm (struct ui_file *file, int from_tty,
 
 char *current_directory;
 
-/* The directory name is actually stored here (usually).  */
-char gdb_dirbuf[1024];
-
 /* The last command line executed on the console.  Used for command
    repetitions.  */
 char *saved_command_line;
diff --git a/gdb/top.h b/gdb/top.h
index 45798897f69..6b660839959 100644
--- a/gdb/top.h
+++ b/gdb/top.h
@@ -219,7 +219,6 @@ extern void ui_unregister_input_event_handler (struct ui *ui);
 /* From top.c.  */
 extern char *saved_command_line;
 extern int confirm;
-extern char gdb_dirbuf[1024];
 extern int inhibit_gdbinit;
 extern const char gdbinit[];