[From http://mirror.keystealth.org/gnu/bash/bash-5.1-patches/bash51-003]
Signed-off-by: Peter Seiderer <ps.report@gmx.net>

			     BASH PATCH REPORT
			     =================

Bash-Release:	5.1
Patch-ID:	bash51-003

Bug-Reported-by:	oguzismailuysal@gmail.com
Bug-Reference-ID:	<CAH7i3LpG91BnNcDtaTUm2Ph7a+PnJkuh6nAc87cVL7_38tOaMQ@mail.gmail.com>
Bug-Reference-URL:	https://lists.gnu.org/archive/html/bug-bash/2020-12/msg00050.html

Bug-Description:

Bash does not put a command substitution process that is started to perform an
expansion in a child process into the right process group where it can receive
keyboard-generated signals.

Patch (apply with `patch -p0'):

*** ../bash-5.1-patched/subst.c	2020-11-16 10:33:15.000000000 -0500
--- b/subst.c	2020-12-12 13:50:11.000000000 -0500
***************
*** 6357,6362 ****
  #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)
      pipeline_pgrp = shell_pgrp;
    cleanup_the_pipeline ();
--- 6357,6364 ----
  #if defined (JOB_CONTROL)
    old_pipeline_pgrp = pipeline_pgrp;
!   /* 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 ();

*** ../bash-5.1/patchlevel.h	2020-06-22 14:51:03.000000000 -0400
--- b/patchlevel.h	2020-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 2
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 3
  
  #endif /* _PATCHLEVEL_H_ */