Added filename emptyness check to the Exif reader, fixes 6120

modules/imgcodecs/src/grfmt_jpeg.cpp

@@ -267,6 +267,8 @@ int JpegDecoder::getOrientation()
 {
     int orientation = JPEG_ORIENTATION_TL;
 
+    if (m_filename.size() > 0)
+    {
         ExifReader reader( m_filename );
         if( reader.parse() )
         {
@@ -276,6 +278,7 @@ int JpegDecoder::getOrientation()
                 orientation = entry.field_u16; //orientation is unsigned short, so check field_u16
             }
         }
+    }
 
     return orientation;
 }

modules/imgcodecs/src/jpeg_exif.cpp

@@ -128,6 +128,11 @@ std::map<int, ExifEntry_t > ExifReader::getExif()
 
     size_t count;
 
+    if (m_filename.size() == 0)
+    {
+        return m_exif;
+    }
+
     FILE* f = fopen( m_filename.c_str(), "rb" );
 
     if( !f )