From: nicm <nicm@openbsd.org>
Date: Mon, 30 May 2022 13:03:46 +0000 (+0000)
Subject: Do not allow pipe-pane on dead panes, from Anindya Mukherjee, GitHub
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=0e69fe996e85666f7ebda739f2a69cba828d99f9;p=openbsd

Do not allow pipe-pane on dead panes, from Anindya Mukherjee, GitHub
issue 3174.
---

diff --git a/usr.bin/tmux/cmd-pipe-pane.c b/usr.bin/tmux/cmd-pipe-pane.c
index fb1c71cea05..1ef733155f0 100644
--- a/usr.bin/tmux/cmd-pipe-pane.c
+++ b/usr.bin/tmux/cmd-pipe-pane.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: cmd-pipe-pane.c,v 1.59 2021/10/24 21:24:17 deraadt Exp $ */
+/* $OpenBSD: cmd-pipe-pane.c,v 1.60 2022/05/30 13:03:46 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -68,6 +68,12 @@ cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
 	struct format_tree		*ft;
 	sigset_t			 set, oldset;
 
+	/* Do nothing if pane is dead. */
+	if (wp->fd == -1 || (wp->flags & PANE_EXITED)) {
+		cmdq_error(item, "target pane has exited");
+		return (CMD_RETURN_ERROR);
+	}
+
 	/* Destroy the old pipe. */
 	old_fd = wp->pipe_fd;
 	if (wp->pipe_fd != -1) {