From a042c731eecd6c6f5c488fa3187af28b18a6c905 Mon Sep 17 00:00:00 2001
From: Chet Ramey <chet.ramey@case.edu>
Date: Sat, 19 Dec 2020 14:29:01 -0500
Subject: [PATCH] Bash-5.1 patch 3: fix command substitution in here-document
 from child process in wrong process group

---
 patchlevel.h | 2 +-
 subst.c      | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/patchlevel.h b/patchlevel.h
index 8a183551..e4d85cf8 100644
--- a/patchlevel.h
+++ b/patchlevel.h
@@ -25,6 +25,6 @@
    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
    looks for to find the patch level (for the sccs version string). */
 
-#define PATCHLEVEL 2
+#define PATCHLEVEL 3
 
 #endif /* _PATCHLEVEL_H_ */
diff --git a/subst.c b/subst.c
index 9ccbf336..23f847f4 100644
--- a/subst.c
+++ b/subst.c
@@ -6356,8 +6356,10 @@ command_substitute (string, quoted, flags)
 
 #if defined (JOB_CONTROL)
   old_pipeline_pgrp = pipeline_pgrp;
-  /* Don't reset the pipeline pgrp if we're already a subshell in a pipeline. */
-  if ((subshell_environment & SUBSHELL_PIPE) == 0)
+  /* Don't reset the pipeline pgrp if we're already a subshell in a pipeline or
+     we've already forked to run a disk command (and are expanding redirections,
+     for example). */
+  if ((subshell_environment & (SUBSHELL_FORK|SUBSHELL_PIPE)) == 0)
     pipeline_pgrp = shell_pgrp;
   cleanup_the_pipeline ();
 #endif /* JOB_CONTROL */
-- 
2.27.0