prevent integer overflow of lineOffsetSize (#1260)

Signed-off-by: Peter Hillman <peterh@wetafx.co.nz>
AcademySoftwareFoundation · Mar 5, 2023 · 8984b04 · 8984b04
1 parent 420da6a
commit 8984b04
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/lib/OpenEXR/ImfScanLineInputFile.cpp b/src/lib/OpenEXR/ImfScanLineInputFile.cpp
@@ -1102,8 +1102,10 @@ void ScanLineInputFile::initialize(const Header& header)
         _data->linesInBuffer =
             numLinesInBuffer (comp);
 
-        int lineOffsetSize = (dataWindow.max.y - dataWindow.min.y +
-                              _data->linesInBuffer) / _data->linesInBuffer;
+        uint64_t lineOffsetSize =
+            (static_cast<int64_t>(dataWindow.max.y) - static_cast<int64_t>(dataWindow.min.y) + static_cast<int64_t>(_data->linesInBuffer)) /
+            static_cast<int64_t>(_data->linesInBuffer);
+
 
         //
         // avoid allocating excessive memory due to large lineOffsets and bytesPerLine table sizes.