From http://ftp.gnu.org/pub/gnu/bash/bash-4.3-patches/bash43-041

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

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

Bash-Release:	4.3
Patch-ID:	bash43-041

Bug-Reported-by:	Hanno Böck <hanno@hboeck.de>
Bug-Reference-ID:	<20150623131106.6f111da9@pc1>, <20150707004640.0e61d2f9@pc1>
Bug-Reference-URL:	http://lists.gnu.org/archive/html/bug-bash/2015-06/msg00089.html,
			http://lists.gnu.org/archive/html/bug-bash/2015-07/msg00018.html

Bug-Description:

There are several out-of-bounds read errors that occur when completing command
lines where assignment statements appear before the command name.  The first
two appear only when programmable completion is enabled; the last one only
happens when listing possible completions.

Patch (apply with `patch -p0'):

*** a/bash-4.3.40/bashline.c	2014-12-29 14:39:43.000000000 -0500
--- b/bashline.c	2015-08-12 10:21:58.000000000 -0400
***************
*** 1469,1476 ****
--- 1469,1489 ----
        os = start;
        n = 0;
+       was_assignment = 0;
        s = find_cmd_start (os);
        e = find_cmd_end (end);
        do
  	{
+ 	  /* Don't read past the end of rl_line_buffer */
+ 	  if (s > rl_end)
+ 	    {
+ 	      s1 = s = e1;
+ 	      break;
+ 	    }
+ 	  /* Or past point if point is within an assignment statement */
+ 	  else if (was_assignment && s > rl_point)
+ 	    {
+ 	      s1 = s = e1;
+ 	      break;
+ 	    }
  	  /* Skip over assignment statements preceding a command name.  If we
  	     don't find a command name at all, we can perform command name
*** a/bash-4.3.40/lib/readline/complete.c	2013-10-14 09:27:10.000000000 -0400
--- b/lib/readline/complete.c	2015-07-31 09:34:39.000000000 -0400
***************
*** 690,693 ****
--- 690,695 ----
    if (temp == 0 || *temp == '\0')
      return (pathname);
+   else if (temp[1] == 0 && temp == pathname)
+     return (pathname);
    /* If the basename is NULL, we might have a pathname like '/usr/src/'.
       Look for a previous slash and, if one is found, return the portion
*** a/bash-4.3/patchlevel.h	2012-12-29 10:47:57.000000000 -0500
--- b/patchlevel.h	2014-03-20 20:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 40
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 41
  
  #endif /* _PATCHLEVEL_H_ */