[gnumeric] xls: fix read crash.

[Morten Welinder <mortenw src gnome org>]

commit 4a7d9f36b7f97813f94d70032ddcd4e4a1e99254
Author: Morten Welinder <terra gnome org>
Date:   Wed Jul 18 11:38:37 2012 -0400

    xls: fix read crash.

 NEWS                          |    3 +++
 plugins/excel/ChangeLog       |    4 ++++
 plugins/excel/ms-excel-read.c |    2 ++
 3 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 774bb75..b99e156 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,8 @@
 Gnumeric 1.11.6
 
+Morten:
+	* Fix xls read crash.  [#679992]
+
 --------------------------------------------------------------------------
 Gnumeric 1.11.5
 
diff --git a/plugins/excel/ChangeLog b/plugins/excel/ChangeLog
index 6ddb102..cd9b823 100644
--- a/plugins/excel/ChangeLog
+++ b/plugins/excel/ChangeLog
@@ -1,3 +1,7 @@
+2012-07-18  Morten Welinder  <terra gnome org>
+
+	* ms-excel-read.c (excel_read_LABEL): Fix crash [#679992].
+
 2012-07-15  Morten Welinder <terra gnome org>
 
 	* Release 1.11.5
diff --git a/plugins/excel/ms-excel-read.c b/plugins/excel/ms-excel-read.c
index 15cbaa0..d39d8a8 100644
--- a/plugins/excel/ms-excel-read.c
+++ b/plugins/excel/ms-excel-read.c
@@ -6216,6 +6216,8 @@ excel_read_LABEL (BiffQuery *q, ExcelReadSheet *esheet, gboolean has_markup)
 	XL_CHECK_CONDITION (q->length - 8 >= in_len);
 
 	xf = excel_set_xf (esheet, q);
+	if (!xf)
+		return;
 	fd = excel_font_get (esheet->container.importer, xf->font_idx);
 
 	txt = excel_get_text_fixme (esheet->container.importer, q->data + 8,