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Bash-4.4 Official Patch 6


From: Chet Ramey
Subject: Bash-4.4 Official Patch 6
Date: Fri, 20 Jan 2017 15:17:34 -0500

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

Bash-Release:   4.4
Patch-ID:       bash44-006

Bug-Reported-by:        <address@hidden>
Bug-Reference-ID:       <address@hidden>
Bug-Reference-URL:      

Bug-Description:

Out-of-range negative offsets to popd can cause the shell to crash attempting
to free an invalid memory block.

Patch (apply with `patch -p0'):

*** ../bash-4.4-patched/builtins/pushd.def      2016-01-25 13:31:49.000000000 
-0500
--- builtins/pushd.def  2016-10-28 10:46:49.000000000 -0400
***************
*** 366,370 ****
      }
  
!   if (which > directory_list_offset || (directory_list_offset == 0 && which 
== 0))
      {
        pushd_error (directory_list_offset, which_word ? which_word : "");
--- 366,370 ----
      }
  
!   if (which > directory_list_offset || (which < -directory_list_offset) || 
(directory_list_offset == 0 && which == 0))
      {
        pushd_error (directory_list_offset, which_word ? which_word : "");
***************
*** 388,391 ****
--- 388,396 ----
         of the list into place. */
        i = (direction == '+') ? directory_list_offset - which : which;
+       if (i < 0 || i > directory_list_offset)
+       {
+         pushd_error (directory_list_offset, which_word ? which_word : "");
+         return (EXECUTION_FAILURE);
+       }
        free (pushd_directory_list[i]);
        directory_list_offset--;
*** ../bash-4.4/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 5
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 6
  
  #endif /* _PATCHLEVEL_H_ */

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



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