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

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

Bug-Reported-by:        [email protected]
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_ */

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