imgcodecs(bmp): make happy UBSAN with enum value range check

diff --git a/modules/imgcodecs/src/grfmt_bmp.cpp b/modules/imgcodecs/src/grfmt_bmp.cpp
index d626de1..6a56d3a 100644 (file)
--- a/modules/imgcodecs/src/grfmt_bmp.cpp
+++ b/modules/imgcodecs/src/grfmt_bmp.cpp
@@ -102,7 +102,9 @@ bool  BmpDecoder::readHeader()
             m_width  = m_strm.getDWord();
             m_height = m_strm.getDWord();
             m_bpp    = m_strm.getDWord() >> 16;
-            m_rle_code = (BmpCompression)m_strm.getDWord();
+            int m_rle_code_ = m_strm.getDWord();
+            CV_Assert(m_rle_code_ >= 0 && m_rle_code_ <= BMP_BITFIELDS);
+            m_rle_code = (BmpCompression)m_rle_code_;
             m_strm.skip(12);
             int clrused = m_strm.getDWord();
             m_strm.skip( size - 36 );