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Bash-4.2 Official Patch 28


From: Chet Ramey
Subject: Bash-4.2 Official Patch 28
Date: Thu, 3 May 2012 22:04:27 -0400

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

Bash-Release:   4.2
Patch-ID:       bash42-028

Bug-Reported-by:        Mark Edgar <address@hidden>
Bug-Reference-ID:       <address@hidden>
Bug-Reference-URL:      
http://lists.gnu.org/archive/html/bug-bash/2012-03/msg00109.html

Bug-Description:

When using a word expansion for which the right hand side is evaluated,
certain expansions of quoted null strings include spurious ^? characters.

Patch (apply with `patch -p0'):

*** ../bash-4.2-patched/subst.c 2012-03-11 17:35:13.000000000 -0400
--- subst.c     2012-03-20 19:30:13.000000000 -0400
***************
*** 5810,5813 ****
--- 5810,5823 ----
        if (qdollaratp && ((hasdol && quoted) || l->next))
        *qdollaratp = 1;
+       /* If we have a quoted null result (QUOTED_NULL(temp)) and the word is
+        a quoted null (l->next == 0 && QUOTED_NULL(l->word->word)), the
+        flags indicate it (l->word->flags & W_HASQUOTEDNULL), and the
+        expansion is quoted (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))
+        (which is more paranoia than anything else), we need to return the
+        quoted null string and set the flags to indicate it. */
+       if (l->next == 0 && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && 
QUOTED_NULL(temp) && QUOTED_NULL(l->word->word) && (l->word->flags & 
W_HASQUOTEDNULL))
+       {
+         w->flags |= W_HASQUOTEDNULL;
+       }
        dispose_words (l);
      }

*** ../bash-4.2-patched/patchlevel.h    Sat Jun 12 20:14:48 2010
--- patchlevel.h        Thu Feb 24 21:41:34 2011
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 27
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 28
  
  #endif /* _PATCHLEVEL_H_ */

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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