svn commit: r343415 - stable/12/lib/libedit

[Jilles Tjoelker]

Author: jilles
Date: Thu Jan 24 22:34:30 2019
New Revision: 343415
URL: https://svnweb.freebsd.org/changeset/base/343415

Log:
  MFC r343105: libedit: Avoid out of bounds read in 'bind' command
  
  This is CVS revision 1.31 from NetBSD lib/libedit/chartype.c:
  Make sure that argv is NULL terminated since functions like tty_stty rely
  on it to be so (Gerry Swinslow)
  
  This broke when the wide-character support was enabled in libedit. The
  conversion from multibyte to wide-character did not supply the apparently
  expected terminating NULL in the new argv array.
  
  PR:		233343

Modified:
  stable/12/lib/libedit/chartype.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/lib/libedit/chartype.c
==============================================================================
--- stable/12/lib/libedit/chartype.c	Thu Jan 24 22:25:52 2019	(r343414)
+++ stable/12/lib/libedit/chartype.c	Thu Jan 24 22:34:30 2019	(r343415)
@@ -157,7 +157,7 @@ ct_decode_argv(int argc, const char *argv[], ct_buffer
 		if (ct_conv_wbuff_resize(conv, bufspace + CT_BUFSIZ) == -1)
 			return NULL;
 
-	wargv = el_malloc((size_t)argc * sizeof(*wargv));
+	wargv = el_malloc((size_t)(argc + 1) * sizeof(*wargv));
 
 	for (i = 0, p = conv->wbuff; i < argc; ++i) {
 		if (!argv[i]) {   /* don't pass null pointers to mbstowcs */
@@ -175,6 +175,7 @@ ct_decode_argv(int argc, const char *argv[], ct_buffer
 		bufspace -= (size_t)bytes;
 		p += bytes;
 	}
+	wargv[i] = NULL;
 
 	return wargv;
 }