Don't set a new value for the END_ variable on the channel before using the

old value.  If you do, it will lead to accessing a memory address that has
been free()'d.  (issue #8895, arkadia)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@51828 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_while.c

@@ -275,8 +275,8 @@ static int _while_exec(struct ast_channel *chan, void *data, int end)
 		pbx_builtin_setvar_helper(chan, my_name, NULL);
         snprintf(end_varname,VAR_SIZE,"END_%s",varname);
 		if ((goto_str=pbx_builtin_getvar_helper(chan, end_varname))) {
-			pbx_builtin_setvar_helper(chan, end_varname, NULL);
 			ast_parseable_goto(chan, goto_str);
+			pbx_builtin_setvar_helper(chan, end_varname, NULL);
 		} else {
 			int pri = find_matching_endwhile(chan);
 			if (pri > 0) {