diff -urNp old/modules/imgcodecs/src/grfmt_bmp.cpp new/modules/imgcodecs/src/grfmt_bmp.cpp
--- old/modules/imgcodecs/src/grfmt_bmp.cpp	2018-04-10 12:43:48.636921073 +0200
+++ new/modules/imgcodecs/src/grfmt_bmp.cpp	2018-04-10 12:49:30.394233343 +0200
@@ -368,6 +368,9 @@ decode_rle4_bad: ;
                                                 gray_palette[code] );
 
                         line_end_flag = y - prev_y;
+
+                        if( y >= m_height )
+                            break;
                     }
                     else if( code > 2 ) // absolute mode
                     {