Bash-5.0 Official Patch 18

[Chet Ramey]

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

Bash-Release:   5.0
Patch-ID:       bash50-018

Bug-Reported-by:        oguzismailuysal@gmail.com
Bug-Reference-ID:
Bug-Reference-URL:      
https://lists.gnu.org/archive/html/bug-bash/2019-10/msg00098.html

Bug-Description:

In certain cases, bash does not perform quoted null removal on patterns
that are used as part of word expansions such as ${parameter##pattern}, so
empty patterns are treated as non-empty.

Patch (apply with `patch -p0'):

*** ../bash-5.0.17/subst.c      2020-04-02 17:14:58.000000000 -0400
--- subst.c     2020-07-09 15:28:19.000000000 -0400
***************
*** 5113,5116 ****
--- 5113,5118 ----
                                      (int *)NULL, (int *)NULL)
             : (WORD_LIST *)0;
+   if (l)
+     word_list_remove_quoted_nulls (l);
    pat = string_list (l);
    dispose_words (l);

*** ../bash-5.0/patchlevel.h    2016-06-22 14:51:03.000000000 -0400
--- patchlevel.h        2016-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 17
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 18
  
  #endif /* _PATCHLEVEL_H_ */

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/