From 9e49d343e3cd7e20dad1b86ebfb764e8027596a7 Mon Sep 17 00:00:00 2001
From: Chet Ramey <chet.ramey@case.edu>
Date: Fri, 24 Apr 2020 11:05:06 -0400
Subject: [PATCH] Bash-5.0 patch 17: better fix for reaping process
 substitution file descriptors

---
 execute_cmd.c | 26 ++++++--------------------
 patchlevel.h  |  2 +-
 subst.c       | 35 +++++++++++++++++++++--------------
 subst.h       |  5 ++---
 4 files changed, 30 insertions(+), 38 deletions(-)

diff --git a/execute_cmd.c b/execute_cmd.c
index 3864986d..4a05758d 100644
--- a/execute_cmd.c
+++ b/execute_cmd.c
@@ -564,7 +564,7 @@ execute_command_internal (command, asynchronous, pipe_in, pipe_out,
   volatile int save_line_number;
 #if defined (PROCESS_SUBSTITUTION)
   volatile int ofifo, nfifo, osize, saved_fifo;
-  volatile char *ofifo_list;
+  volatile void *ofifo_list;
 #endif
 
   if (breaking || continuing)
@@ -750,12 +750,14 @@ execute_command_internal (command, asynchronous, pipe_in, pipe_out,
   reap_procsubs ();
 #  endif
 
-  if (variable_context != 0)	/* XXX - also if sourcelevel != 0? */
+  /* XXX - also if sourcelevel != 0? */
+  if (variable_context != 0)
     {
       ofifo = num_fifos ();
       ofifo_list = copy_fifo_list ((int *)&osize);
       begin_unwind_frame ("internal_fifos");
-      add_unwind_protect (xfree, ofifo_list);
+      if (ofifo_list)
+	add_unwind_protect (xfree, ofifo_list);
       saved_fifo = 1;
     }
   else
@@ -1099,26 +1101,10 @@ execute_command_internal (command, asynchronous, pipe_in, pipe_out,
     {
       nfifo = num_fifos ();
       if (nfifo > ofifo)
-	close_new_fifos ((char *)ofifo_list, osize);
+	close_new_fifos ((void *)ofifo_list, osize);
       free ((void *)ofifo_list);
       discard_unwind_frame ("internal_fifos");
     }
-# if defined (HAVE_DEV_FD)
-  /* Reap process substitutions at the end of loops */
-  switch (command->type)
-    {
-    case cm_while:
-    case cm_until:
-    case cm_for:
-    case cm_group:
-#    if defined (ARITH_FOR_COMMAND)
-    case cm_arith_for:
-#    endif
-      reap_procsubs ();
-    default:
-      break;
-    }
-#  endif /* HAVE_DEV_FD */
 #endif
 
   /* Invert the return value if we have to */
diff --git a/patchlevel.h b/patchlevel.h
index 9074f4dd..98e714da 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 16
+#define PATCHLEVEL 17
 
 #endif /* _PATCHLEVEL_H_ */
diff --git a/subst.c b/subst.c
index fd6db240..8884b487 100644
--- a/subst.c
+++ b/subst.c
@@ -5336,13 +5336,13 @@ clear_fifo_list ()
 {
 }
 
-char *
+void *
 copy_fifo_list (sizep)
      int *sizep;
 {
   if (sizep)
     *sizep = 0;
-  return (char *)NULL;
+  return (void *)NULL;
 }
 
 static void
@@ -5408,8 +5408,13 @@ unlink_fifo_list ()
       for (i = j = 0; i < nfifo; i++)
 	if (fifo_list[i].file)
 	  {
-	    fifo_list[j].file = fifo_list[i].file;
-	    fifo_list[j].proc = fifo_list[i].proc;
+	    if (i != j)
+	      {
+		fifo_list[j].file = fifo_list[i].file;
+		fifo_list[j].proc = fifo_list[i].proc;
+		fifo_list[i].file = (char *)NULL;
+		fifo_list[i].proc = 0;
+	      }
 	    j++;
 	  }
       nfifo = j;
@@ -5425,10 +5430,11 @@ unlink_fifo_list ()
    case it's larger than fifo_list_size (size of fifo_list). */
 void
 close_new_fifos (list, lsize)
-     char *list;
+     void *list;
      int lsize;
 {
   int i;
+  char *plist;
 
   if (list == 0)
     {
@@ -5436,8 +5442,8 @@ close_new_fifos (list, lsize)
       return;
     }
 
-  for (i = 0; i < lsize; i++)
-    if (list[i] == 0 && i < fifo_list_size && fifo_list[i].proc != -1)
+  for (plist = (char *)list, i = 0; i < lsize; i++)
+    if (plist[i] == 0 && i < fifo_list_size && fifo_list[i].proc != -1)
       unlink_fifo (i);
 
   for (i = lsize; i < fifo_list_size; i++)
@@ -5559,22 +5565,22 @@ clear_fifo_list ()
   nfds = 0;
 }
 
-char *
+void *
 copy_fifo_list (sizep)
      int *sizep;
 {
-  char *ret;
+  void *ret;
 
   if (nfds == 0 || totfds == 0)
     {
       if (sizep)
 	*sizep = 0;
-      return (char *)NULL;
+      return (void *)NULL;
     }
 
   if (sizep)
     *sizep = totfds;
-  ret = (char *)xmalloc (totfds * sizeof (pid_t));
+  ret = xmalloc (totfds * sizeof (pid_t));
   return (memcpy (ret, dev_fd_list, totfds * sizeof (pid_t)));
 }
 
@@ -5647,10 +5653,11 @@ unlink_fifo_list ()
    totfds (size of dev_fd_list). */
 void
 close_new_fifos (list, lsize)
-     char *list;
+     void *list;
      int lsize;
 {
   int i;
+  pid_t *plist;
 
   if (list == 0)
     {
@@ -5658,8 +5665,8 @@ close_new_fifos (list, lsize)
       return;
     }
 
-  for (i = 0; i < lsize; i++)
-    if (list[i] == 0 && i < totfds && dev_fd_list[i])
+  for (plist = (pid_t *)list, i = 0; i < lsize; i++)
+    if (plist[i] == 0 && i < totfds && dev_fd_list[i])
       unlink_fifo (i);
 
   for (i = lsize; i < totfds; i++)
diff --git a/subst.h b/subst.h
index 34763222..faf831bd 100644
--- a/subst.h
+++ b/subst.h
@@ -273,9 +273,8 @@ extern int num_fifos __P((void));
 extern void unlink_fifo_list __P((void));
 extern void unlink_fifo __P((int));
 
-extern char *copy_fifo_list __P((int *));
-extern void unlink_new_fifos __P((char *, int));
-extern void close_new_fifos __P((char *, int));
+extern void *copy_fifo_list __P((int *));
+extern void close_new_fifos __P((void *, int));
 
 extern void clear_fifo_list __P((void));
 
-- 
2.25.1