File openexr-CVE-2021-3933.patch of Package openexr.22326

Index: openexr-2.2.1/IlmImf/ImfMisc.cpp
===================================================================
--- openexr-2.2.1.orig/IlmImf/ImfMisc.cpp	2021-11-09 11:34:04.683045514 +0100
+++ openexr-2.2.1/IlmImf/ImfMisc.cpp	2021-11-09 12:49:23.721792651 +0100
@@ -167,16 +167,28 @@ bytesPerDeepLineTable (const Header &hea
          c != channels.end();
          ++c)
     {
+        const uint64_t pixelSize = pixelTypeSize (c.channel().type);
+
         for (int y = minY; y <= maxY; ++y)
             if (modp (y, c.channel().ySampling) == 0)
             {
-                int nBytes = 0;
+                uint64_t nBytes = 0;
                 for (int x = dataWindow.min.x; x <= dataWindow.max.x; x++)
                 {
                     if (modp (x, c.channel().xSampling) == 0)
-                        nBytes += pixelTypeSize (c.channel().type) *
-                                  sampleCount(base, xStride, yStride, x, y);
+                        nBytes += pixelSize *
+                                  static_cast<uint64_t>(sampleCount(base, xStride, yStride, x, y));
                 }
+
+                //
+                // architectures where size_t is smaller than 64 bits may overflow
+                // (scanlines with more than 2^32 bytes are not currently supported so this should not occur with valid files)
+                //
+                if( static_cast<uint64_t>(bytesPerLine[y - dataWindow.min.y]) + nBytes > SIZE_MAX)
+                {
+                    throw IEX_NAMESPACE::IoExc("Scanline size too large");
+                }
+
                 bytesPerLine[y - dataWindow.min.y] += nBytes;
             }
     }