rn 4.3 patch #35

[Larry Wall]

System: rn version 4.3
Patch #: 35
Priority: MEDIUM
Subject: rn -c can produce a memory fault
From: jeffb at leia.GWD.TEK.COM (Jeff Beachy)

Description:
	Patch #14 attempted to speed up "rn -c" by using a static buffer
	instead of an malloc'ed one.  Unfortunately, buried deep down in
	a routine called checkexpired there was an unguarded call to
	saferealloc(), which calls realloc().  This will confuse realloc()
	to no end, since it doesn't know how large the area being realloc'ed
	is to begin with.

Fix:	From rn, say "| patch -d DIR", where DIR is your rn source directory.
	Outside of rn, say "cd DIR; patch <thisarticle".  If you don't have
	the patch program, apply the following by hand, or get patch.

	If patch indicates that patchlevel is the wrong version, you may need
	to apply one or more previous patches, or the patch may already
	have been applied.  See the patchlevel file to find out what has or
	has not been applied.  In any event, don't continue with the patch.

	If you are missing previous patches they can be obtained from me:

	Larry Wall
	{allegra,burdvax,cbosgd,hplabs,ihnp4,sdcsvax}!sdcrdcf!lwall

	If you send a mail message of the following form it will greatly speed
	processing:

	Subject: Command
	@SH mailpatch PATH rn 4.3 NUM ...

	where PATH is a return path FROM ME TO YOU in bang notation, and NUM
	is the number of one or more patches you need, separated by spaces.

Index: patchlevel
Prereq: 34
1c1
< Patch #: 34
---
> Patch #: 35

Index: rcln.c
Prereq: 4.3.1.2
*** rcln.c.old	Tue Nov  4 15:58:18 1986
--- rcln.c	Tue Nov  4 15:58:23 1986
***************
*** 1,4
! /* $Header: rcln.c,v 4.3.1.2 85/07/23 17:39:08 lwall Exp $
   *
   * $Log:	rcln.c,v $
   * Revision 4.3.1.2  85/07/23  17:39:08  lwall

--- 1,4 -----
! /* $Header: rcln.c,v 4.3.1.3 86/11/04 15:57:03 lwall Exp $
   *
   * $Log:	rcln.c,v $
   * Revision 4.3.1.3  86/11/04  15:57:03  lwall
***************
*** 1,6
  /* $Header: rcln.c,v 4.3.1.2 85/07/23 17:39:08 lwall Exp $
   *
   * $Log:	rcln.c,v $
   * Revision 4.3.1.2  85/07/23  17:39:08  lwall
   * Oops, was freeing a static buf on -c in checkexpired.
   * 

--- 1,9 -----
  /* $Header: rcln.c,v 4.3.1.3 86/11/04 15:57:03 lwall Exp $
   *
   * $Log:	rcln.c,v $
+  * Revision 4.3.1.3  86/11/04  15:57:03  lwall
+  * realloc attempted on unalloced area.
+  * 
   * Revision 4.3.1.2  85/07/23  17:39:08  lwall
   * Oops, was freeing a static buf on -c in checkexpired.
   * 
***************
*** 427,433
  	*t++ = ',';
  	strcpy(t,s);
      }
!     if (mbuf == rcline[ngnum]) {
  	rcline[ngnum] = saferealloc(rcline[ngnum],
  	    (MEM_SIZE)(rcnums[ngnum] + strlen(newnum) + 1));
      }

--- 430,436 -----
  	*t++ = ',';
  	strcpy(t,s);
      }
!     if (!checkflag && mbuf == rcline[ngnum]) {
  	rcline[ngnum] = saferealloc(rcline[ngnum],
  	    (MEM_SIZE)(rcnums[ngnum] + strlen(newnum) + 1));
      }