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

Bash-Release:	4.2
Patch-ID:	bash42-043

Bug-Reported-by:	konsolebox <konsolebox@gmail.com>
Bug-Reference-ID:	<CAJnmqwZuGKLgMsMwxRK4LL+2NN+HgvmKzrnode99QBGrcgX1Lw@mail.gmail.com>
Bug-Reference-URL:	http://lists.gnu.org/archive/html/bug-bash/2013-01/msg00138.html

Bug-Description:

When SIGCHLD is trapped, and a SIGCHLD trap handler runs when a pending
`read -t' invocation times out and generates SIGALRM, bash can crash with
a segmentation fault.

Patch (apply with `patch -p0'):

*** ../bash-4.2-patched/builtins/read.def	2012-10-31 21:22:51.000517000 -0400
--- builtins/read.def	2013-01-25 10:28:16.000038000 -0500
***************
*** 386,393 ****
  	  /* Tricky.  The top of the unwind-protect stack is the free of
  	     input_string.  We want to run all the rest and use input_string,
! 	     so we have to remove it from the stack. */
! 	  remove_unwind_protect ();
! 	  run_unwind_frame ("read_builtin");
  	  input_string[i] = '\0';	/* make sure it's terminated */
  	  retval = 128+SIGALRM;
  	  goto assign_vars;
--- 386,403 ----
  	  /* Tricky.  The top of the unwind-protect stack is the free of
  	     input_string.  We want to run all the rest and use input_string,
! 	     so we have to save input_string temporarily, run the unwind-
! 	     protects, then restore input_string so we can use it later. */
! 
  	  input_string[i] = '\0';	/* make sure it's terminated */
+ 	  if (i == 0)
+ 	    {
+ 	      t = (char *)xmalloc (1);
+ 	      t[0] = 0;
+ 	    }
+ 	  else
+ 	    t = savestring (input_string);
+ 
+ 	  run_unwind_frame ("read_builtin");
+ 	  input_string = t;
  	  retval = 128+SIGALRM;
  	  goto assign_vars;

*** ../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 42
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 43
  
  #endif /* _PATCHLEVEL_H_ */