[gnumeric] Fix crash on corrupted files. [#705420]

[Andreas J. Guelzow <guelzow src gnome org>]

commit e22b5ccac2ccb41f54b0aee94d64d65246b0dfe7
Author: Andreas J Guelzow <aguelzow pyrshep ca>
Date:   Sun Aug 4 11:34:05 2013 -0600

    Fix crash on corrupted files. [#705420]
    
    2013-08-03  Andreas J. Guelzow <aguelzow pyrshep ca>
    
        * openoffice-read.c (odf_parse_range_address_or_expr): initialize
        GnmRangeRef

 NEWS                                 |    2 +-
 plugins/openoffice/ChangeLog         |    5 +++++
 plugins/openoffice/openoffice-read.c |    7 +++++--
 3 files changed, 11 insertions(+), 3 deletions(-)
---
diff --git a/NEWS b/NEWS
index bbe3ed9..4f345c1 100644
--- a/NEWS
+++ b/NEWS
@@ -9,7 +9,7 @@ Andreas:
        * Improve import to ODF of empty cells with default column styles. [#704563]
        * Speed up loading of some ODF files. [#704422]
        * Fix ODF style import. [#704563]
-       * Fix crash on corrupted files. [#704636] [#705385] [#705421]
+       * Fix crash on corrupted files. [#704636] [#705385] [#705421] [#705420]
        * Fix ODF import of charts with series consisting of multiple ranges. [#704742]
        * Fix ODF export of charts with series consisting of multiple ranges.
        * Implement input message editing. [Part of #705310]
diff --git a/plugins/openoffice/ChangeLog b/plugins/openoffice/ChangeLog
index 84e6237..9580c43 100644
--- a/plugins/openoffice/ChangeLog
+++ b/plugins/openoffice/ChangeLog
@@ -1,5 +1,10 @@
 2013-08-03  Andreas J. Guelzow <aguelzow pyrshep ca>
 
+       * openoffice-read.c (odf_parse_range_address_or_expr): initialize
+       GnmRangeRef
+
+2013-08-03  Andreas J. Guelzow <aguelzow pyrshep ca>
+
        * openoffice-write.c (xl_find_conditional_format): There might
        only be a single conditional part!
 
diff --git a/plugins/openoffice/openoffice-read.c b/plugins/openoffice/openoffice-read.c
index 0e19c78..793b73a 100644
--- a/plugins/openoffice/openoffice-read.c
+++ b/plugins/openoffice/openoffice-read.c
@@ -2049,10 +2049,13 @@ odf_parse_range_address_or_expr (GsfXMLIn *xin, char const *str)
        GnmExprTop const *texpr = NULL;
        OOFormula f_type = odf_get_formula_type (xin, &str);
 
-       if (f_type != FORMULA_NOT_SUPPORTED) {
+       if (str != NULL && strlen (str) > 0 && f_type != FORMULA_NOT_SUPPORTED) {
                GnmParsePos pp;
                GnmRangeRef ref;
-               char const *ptr = oo_rangeref_parse
+               char const *ptr;
+               gnm_cellref_init (&ref.a, invalid_sheet, 0, 0, TRUE);
+               gnm_cellref_init (&ref.b, invalid_sheet, 0, 0, TRUE);
+               ptr = oo_rangeref_parse
                        (&ref, str,
                         parse_pos_init_sheet (&pp, state->pos.sheet),
                         NULL);