Avoid integer overflow in calculateNumTiles()

Signed-off-by: Cary Phillips <cary@ilm.com>
AcademySoftwareFoundation · Aug 9, 2020 · b10412d · b10412d
1 parent ed46931
commit b10412d
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/OpenEXR/IlmImf/ImfTiledMisc.cpp b/OpenEXR/IlmImf/ImfTiledMisc.cpp
@@ -301,7 +301,11 @@ calculateNumTiles (int *numTiles,
 {
     for (int i = 0; i < numLevels; i++)
     {
-	numTiles[i] = (levelSize (min, max, i, rmode) + size - 1) / size;
+	int l = levelSize (min, max, i, rmode);
+        if (l >= std::numeric_limits<int>::max() - size + 1)
+            throw IEX_NAMESPACE::ArgExc ("Invalid size.");
+
+	numTiles[i] = (l + size - 1) / size;
     }
 }