check arguments

1 files changed, 6 insertions, 0 deletions

diff --git a/src/lib/WT602Document.cpp b/src/lib/WT602Document.cpp
index efc7733..e9745e8 100644
--- a/src/lib/WT602Document.cpp
+++ b/src/lib/WT602Document.cpp
@@ -37,6 +37,9 @@ RVNGInputStreamPtr getContent(librevenge::RVNGInputStream *const ip)
 
 bool WT602Document::isSupported(librevenge::RVNGInputStream *input) try
 {
+  if (!input)
+    return false;
+
   RVNGInputStreamPtr content = getContent(input);
   if (bool(content))
   {
@@ -54,6 +57,9 @@ catch (...)
 
 bool WT602Document::parse(librevenge::RVNGInputStream *input, librevenge::RVNGTextInterface *document) try
 {
+  if (!input || !document)
+    return false;
+
   if (!WT602Document::isSupported(input))
     return false;