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From 2965eca924466a48c5597ac5c6c86d470e718908 Mon Sep 17 00:00:00 2001
From: Chet Ramey <chet.ramey@case.edu>
Date: Mon, 14 Nov 2016 14:27:35 -0500
Subject: [PATCH] Bash-4.4 patch 4

---
 jobs.c       | 15 +++++++++++++++
 jobs.h       |  1 +
 patchlevel.h |  2 +-
 subst.c      |  5 +----
 4 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/jobs.c b/jobs.c
index cef3c79..fc96603 100644
--- a/jobs.c
+++ b/jobs.c
@@ -453,6 +453,21 @@ cleanup_the_pipeline ()
     discard_pipeline (disposer);
 }
 
+void
+discard_last_procsub_child ()
+{
+  PROCESS *disposer;
+  sigset_t set, oset;
+
+  BLOCK_CHILD (set, oset);
+  disposer = last_procsub_child;
+  last_procsub_child = (PROCESS *)NULL;
+  UNBLOCK_CHILD (oset);
+
+  if (disposer)
+    discard_pipeline (disposer);
+}
+
 struct pipeline_saver *
 alloc_pipeline_saver ()
 {
diff --git a/jobs.h b/jobs.h
index 4ba3513..6df0607 100644
--- a/jobs.h
+++ b/jobs.h
@@ -190,6 +190,7 @@ extern JOB **jobs;
 extern void making_children __P((void));
 extern void stop_making_children __P((void));
 extern void cleanup_the_pipeline __P((void));
+extern void discard_last_procsub_child __P((void));
 extern void save_pipeline __P((int));
 extern PROCESS *restore_pipeline __P((int));
 extern void start_pipeline __P((void));
diff --git a/patchlevel.h b/patchlevel.h
index e7e960c..c059f0b 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 3
+#define PATCHLEVEL 4
 
 #endif /* _PATCHLEVEL_H_ */
diff --git a/subst.c b/subst.c
index 4d498ef..298187d 100644
--- a/subst.c
+++ b/subst.c
@@ -5808,10 +5808,7 @@ process_substitute (string, open_for_read_in_child)
     {
 #if defined (JOB_CONTROL)
       if (last_procsub_child)
-	{
-	  discard_pipeline (last_procsub_child);
-	  last_procsub_child = (PROCESS *)NULL;
-	}
+	discard_last_procsub_child ();
       last_procsub_child = restore_pipeline (0);
 #endif
 
-- 
2.9.3