File openexr-CVE-2021-20300.patch of Package openexr.20698

diff --git a/OpenEXR/IlmImf/ImfHuf.cpp b/OpenEXR/IlmImf/ImfHuf.cpp
index 7bd7fc00d..23cfcfd6c 100644
--- a/IlmImf/ImfHuf.cpp
+++ b/IlmImf/ImfHuf.cpp
@@ -1093,7 +1093,9 @@ hufUncompress (const char compressed[],
 
     const char *ptr = compressed + 20;
 
-    if ( ptr + (nBits+7 )/8 > compressed+nCompressed)
+    unsigned long long nBytes = (static_cast<unsigned long long>(nBits)+7) / 8 ;
+
+    if ( ptr + nBytes > compressed+nCompressed)
     {
         notEnoughData();
         return;