Fixes for memory leaks reported by Lu Ming Yin, fixes from Howard Chu.

arguments.c

@@ -171,6 +171,8 @@ args_parse_flag_argument(struct args_value *values, u_int count, char **cause,
 		if (optional_argument) {
 			log_debug("%s: -%c (optional)", __func__, flag);
 			args_set(args, flag, NULL, ARGS_ENTRY_OPTIONAL_VALUE);
+			args_free_value(new);
+			free(new);
 			return (0); /* either - or end */
 		}
 		xasprintf(cause, "-%c expects an argument", flag);
@@ -662,6 +664,8 @@ args_set(struct args *args, u_char flag, struct args_value *value, int flags)
 		entry->count++;
 	if (value != NULL && value->type != ARGS_NONE)
 		TAILQ_INSERT_TAIL(&entry->values, value, entry);
+	else
+		free(value);
 }
 
 /* Get argument value. Will be NULL if it isn't present. */

cmd-command-prompt.c

@@ -143,6 +143,7 @@ cmd_command_prompt_exec(struct cmd *self, struct cmdq_item *item)
 		cdata->prompt_type = status_prompt_type(type);
 		if (cdata->prompt_type == PROMPT_TYPE_INVALID) {
 			cmdq_error(item, "unknown type: %s", type);
+			cmd_command_prompt_free(cdata);
 			return (CMD_RETURN_ERROR);
 		}
 	} else

cmd-confirm-before.c

@@ -76,8 +76,10 @@ cmd_confirm_before_exec(struct cmd *self, struct cmdq_item *item)
 
 	cdata = xcalloc(1, sizeof *cdata);
 	cdata->cmdlist = args_make_commands_now(self, item, 0, 1);
-	if (cdata->cmdlist == NULL)
+	if (cdata->cmdlist == NULL) {
+		free(cdata);
 		return (CMD_RETURN_ERROR);
+	}
 
 	if (wait)
 		cdata->item = item;

layout-custom.c

@@ -230,7 +230,7 @@ layout_parse(struct window *w, const char *layout, char **cause)
 	/* Check the new layout. */
 	if (!layout_check(lc)) {
 		*cause = xstrdup("size mismatch after applying layout");
-		return (-1);
+		goto fail;
 	}
 
 	/* Resize to the layout size. */