File sudo-dont-enable-read-after-pty_finish.patch of Package sudo.27911

diff --git a/src/exec_pty.c b/src/exec_pty.c
index c1ccd4b..7430137 100644
--- a/src/exec_pty.c
+++ b/src/exec_pty.c
@@ -748,12 +748,15 @@ write_callback(int fd, int what, void *v)
 	    if (sudo_ev_add(evbase, iob->wevent, NULL, false) == -1)
 		sudo_fatal(U_("unable to add event to queue"));
 	}
-	/* Enable reader if buffer is not full. */
-	if (iob->revent != NULL &&
-	    (ttymode == TERM_RAW || !USERTTY_EVENT(iob->revent))) {
-	    if (iob->len != sizeof(iob->buf)) {
-		if (sudo_ev_add(evbase, iob->revent, NULL, false) == -1)
-		    sudo_fatal(U_("unable to add event to queue"));
+	/*
+	 * Enable reader if buffer is not full but avoid reading /dev/tty
+	 * if not in raw mode or the command is no longer running.
+	 */
+	if (iob->revent != NULL && iob->len != sizeof(iob->buf)) {
+	  if (!USERTTY_EVENT(iob->revent) ||
+	      (ttymode == TERM_RAW && iob->ec->cmnd_pid != -1)) {
+	    if (sudo_ev_add(evbase, iob->revent, NULL, false) == -1)
+	      sudo_fatal(U_("unable to add event to queue"));
 	    }
 	}
     }