xmlsecurity: avoid throwing io::IOException when OOXML export misbehaves

The root cause (and that still needs fixing) is that the OOXML signature
export fails to start same-document references with a "#" character.
OTOH, even if that happens, it's better to throw uno::RuntimeException
in UriBindingHelper::OpenInputStream() to avoid std::terminate().

Change-Id: I9c9c211de36fb0aeb2c33f62b094c9f4d9c85b3d
(cherry picked from commit f55914f7be1209718ff96527653cc33cd80f9d2e)

1 files changed, 5 insertions, 1 deletions

diff --git a/xmlsecurity/source/helper/xmlsignaturehelper2.cxx b/xmlsecurity/source/helper/xmlsignaturehelper2.cxx
index ebc8a1d8f051..314079510efa 100644
--- a/xmlsecurity/source/helper/xmlsignaturehelper2.cxx
+++ b/xmlsecurity/source/helper/xmlsignaturehelper2.cxx
@@ -205,7 +205,11 @@ uno::Reference < io::XInputStream > UriBindingHelper::OpenInputStream( const uno
             throw uno::Exception("Could not decode URI for stream element.", nullptr);
 
         uno::Reference< io::XStream > xStream;
-        xStream = rxStore->cloneStreamElement( sName );
+        uno::Reference<container::XNameAccess> xNameAccess(rxStore, uno::UNO_QUERY);
+        if (!xNameAccess->hasByName(sName))
+            SAL_WARN("xmlsecurity.helper", "expected stream, but not found: " << sName);
+        else
+            xStream = rxStore->cloneStreamElement( sName );
         if ( !xStream.is() )
             throw uno::RuntimeException();
         xInStream = xStream->getInputStream();