Merge pull request #105 from jaganmn/master

Patch integer overflow in 'Rcpp::wrap(<Eigen::Matrix>)'

Author: eddelbuettel

ChangeLog

@@ -1,3 +1,7 @@
+2022-01-15  Mikael Jagan  <jaganmn@mcmaster.ca>
+
+	* inst/include/RcppEigenWrap.h: Use R_xlen_t for vectors rows + cols
+
 2021-12-29  Dirk Eddelbuettel  <edd@debian.org>
 
 	* README.md: Add total downloads badge

inst/include/RcppEigenWrap.h

@@ -2,7 +2,7 @@
 //
 // RcppEigenWrap.h: Rcpp wrap methods for Eigen matrices, vectors and arrays
 //
-// Copyright (C) 2011 - 2012   Douglas Bates, Dirk Eddelbuettel and Romain Francois
+// Copyright (C) 2011 - 2022   Douglas Bates, Dirk Eddelbuettel and Romain Francois
 //
 // This file is part of RcppEigen.
 //
@@ -80,16 +80,19 @@ namespace Rcpp{
 
         // for plain dense objects
         template <typename T>
-        SEXP eigen_wrap_plain_dense( const T& obj, Rcpp::traits::true_type ){
-			typename Eigen::internal::conditional<T::IsRowMajor,
-												  Eigen::Matrix<typename T::Scalar,
-																T::RowsAtCompileTime,
-																T::ColsAtCompileTime>,
-												  const T&>::type objCopy(obj);
-            int m = obj.rows(), n = obj.cols();
-			R_xlen_t size = static_cast<R_xlen_t>(m) * n;
-			SEXP ans = PROTECT(::Rcpp::wrap(objCopy.data(), objCopy.data() + size));
-            if( T::ColsAtCompileTime != 1 ) {
+        SEXP eigen_wrap_plain_dense( const T& obj, Rcpp::traits::true_type ) {
+            typename Eigen::internal::conditional<
+                T::IsRowMajor,
+                Eigen::Matrix<typename T::Scalar,
+                              T::RowsAtCompileTime,
+                              T::ColsAtCompileTime>,
+                const T&>::type objCopy(obj);
+            R_xlen_t m = obj.rows(), n = obj.cols(), size = m * n;
+            SEXP ans = PROTECT(::Rcpp::wrap(objCopy.data(), objCopy.data() + size));
+            if ( T::ColsAtCompileTime != 1 ) {
+                if (m > INT_MAX || n > INT_MAX) {
+                    Rcpp::stop("array dimensions cannot exceed INT_MAX");
+                }
                 SEXP dd = PROTECT(::Rf_allocVector(INTSXP, 2));
                 int *d = INTEGER(dd);
                 d[0] = m;