1 This patch taken directly from upstream:

     2 http://git.gnome.org/browse/libxml2/commit/?id=69f04562f75212bfcabecd190ea8b06ace28ece2

     3 --- libxml2-2.7.6/encoding.c	Thu Sep 24 08:31:59 2009

     4 +++ libxml2-2.7.6/new.encoding.c	Mon Oct 24 11:11:46 2011

     5 @@ -1771,7 +1771,7 @@

     6      if (in == NULL) return(-1);

     7  

     8      /* calculate space available */

     9 -    written = out->size - out->use;

    10 +    written = out->size - out->use - 1; /* count '\0' */

    11      toconv = in->use;

    12      /*

    13       * echo '<?xml version="1.0" encoding="UCS4"?>' | wc -c => 38

    14 @@ -1892,7 +1892,7 @@

    15      toconv = in->use;

    16      if (toconv == 0)

    17          return (0);

    18 -    written = out->size - out->use;

    19 +    written = out->size - out->use - 1; /* count '\0' */

    20      if (toconv * 2 >= written) {

    21          xmlBufferGrow(out, out->size + toconv * 2);

    22          written = out->size - out->use - 1;