Catch error when decompressing

Make sure we catch errors when thrown by zlib

Fixes https://gitlab.com/kicad/code/kicad/issues/5376

plugins/3d/oce/loadmodel.cpp

@@ -481,7 +481,17 @@ bool readSTEPZ( Handle(TDocStd_Document)& m_doc, const char* aFileName )
         char *buffer = new char[size];
 
         ifile.Read( buffer, size);
-        std::string expanded = gzip::decompress( buffer, size );
+        std::string expanded;
+
+        try
+        {
+            expanded = gzip::decompress( buffer, size );
+        }
+        catch(...)
+        {
+            delete[] buffer;
+            return false;
+        }
 
         delete[] buffer;
 

plugins/3d/vrml/vrml.cpp

@@ -187,7 +187,17 @@ SCENEGRAPH* LoadVRML( const wxString& aFileName, bool useInline )
             char *buffer = new char[size];
 
             ifile.Read( buffer, size);
-            std::string expanded = gzip::decompress( buffer, size );
+            std::string expanded;
+
+            try
+            {
+                expanded = gzip::decompress( buffer, size );
+            }
+            catch(...)
+            {
+                delete[] buffer;
+                return nullptr;
+            }
 
             delete[] buffer;
 

utils/kicad2step/pcb/oce_utils.cpp

@@ -995,7 +995,17 @@ bool PCBMODEL::getModelLabel( const std::string aFileName, TRIPLET aScale, TDF_L
                 char *buffer = new char[size];
 
                 ifile.Read( buffer, size);
-                std::string expanded = gzip::decompress( buffer, size );
+                std::string expanded;
+
+                try
+                {
+                    expanded = gzip::decompress( buffer, size );
+                }
+                catch(...)
+                {
+                    delete[] buffer;
+                    return false;
+                }
 
                 delete[] buffer;