From af1496b300cd755dcffd514ed0a329943f633cd4 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 30 May 2022 13:03:46 +0000
Subject: [PATCH] Do not allow pipe-pane on dead panes, from Anindya Mukherjee,
 GitHub issue 3174.

---
 cmd-pipe-pane.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cmd-pipe-pane.c b/cmd-pipe-pane.c
index 1a8c851b..bedc8f24 100644
--- a/cmd-pipe-pane.c
+++ b/cmd-pipe-pane.c
@@ -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) {