Fix recently introduced bool vector overrun.

This was due to an optimization that went awry.
Reported by Glenn Morris in
<http://lists.gnu.org/archive/html/emacs-devel/2013-11/msg00622.html>.
* alloc.c (make_uninit_bool_vector): Don't allocate a dummy word
for empty vectors, undoing the 2013-11-18 change.
* data.c (bool_vector_binop_driver): Rely on this.
Fix bug that occasionally overran the destination.
* lisp.h (struct Lisp_Bool_vector): Document this.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index e0ac7f298c7..925f6389bf8 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,15 @@
+2013-11-21  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Fix recently introduced bool vector overrun.
+        This was due to an optimization that went awry.
+        Reported by Glenn Morris in
+        <http://lists.gnu.org/archive/html/emacs-devel/2013-11/msg00622.html>.
+        * alloc.c (make_uninit_bool_vector): Don't allocate a dummy word
+        for empty vectors, undoing the 2013-11-18 change.
+        * data.c (bool_vector_binop_driver): Rely on this.
+        Fix bug that occasionally overran the destination.
+        * lisp.h (struct Lisp_Bool_vector): Document this.
+
 2013-11-20  Jan Djärv  <jan.h.d@swipnet.se>
 
         * nsterm.m (init, run, stop:): Enable again. stop calls super stop