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bug #363 - check for integer overflow in size=rows*cols computations

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This commit is contained in:
Benoit Jacob 2011-10-16 16:12:19 -04:00
parent 0c6055c285
commit 739559b08a
1 changed files with 24 additions and 0 deletions
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24
Eigen/src/Core/PlainObjectBase.h
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@ -34,6 +34,24 @@
namespace internal {
template<typename Index>
void check_rows_cols_for_overflow(Index rows, Index cols)
{
#ifdef EIGEN_EXCEPTIONS
// http://hg.mozilla.org/mozilla-central/file/6c8a909977d3/xpcom/ds/CheckedInt.h#l242
// we assume Index is signed
Index max_index = (Index(1) << (8 * sizeof(Index) - 1)) - 1; // assume Index is signed
bool error = (x < 0 || y < 0) ? true
: (x == 0 || y == 0) ? false
: (x > max_index / y);
if (error)
throw std::bad_alloc();
#else
(void) rows;
(void) cols;
#endif
}
template <typename Derived, typename OtherDerived = Derived, bool IsVector = static_cast<bool>(Derived::IsVectorAtCompileTime)> struct conservative_resize_like_impl;
template<typename MatrixTypeA, typename MatrixTypeB, bool SwapPointers> struct matrix_swap_impl;
@ -200,11 +218,13 @@ class PlainObjectBase : public internal::dense_xpr_base<Derived>::type
EIGEN_STRONG_INLINE void resize(Index rows, Index cols)
{
#ifdef EIGEN_INITIALIZE_MATRICES_BY_ZERO
internal::check_rows_cols_for_overflow(rows, cols);
Index size = rows*cols;
bool size_changed = size != this->size();
m_storage.resize(size, rows, cols);
if(size_changed) EIGEN_INITIALIZE_BY_ZERO_IF_THAT_OPTION_IS_ENABLED
#else
internal::check_rows_cols_for_overflow(rows, cols);
m_storage.resize(rows*cols, rows, cols);
#endif
}
@ -273,6 +293,7 @@ class PlainObjectBase : public internal::dense_xpr_base<Derived>::type
EIGEN_STRONG_INLINE void resizeLike(const EigenBase<OtherDerived>& _other)
{
const OtherDerived& other = _other.derived();
internal::check_rows_cols_for_overflow(other.rows(), other.cols());
const Index othersize = other.rows()*other.cols();
if(RowsAtCompileTime == 1)
{
@ -417,6 +438,7 @@ class PlainObjectBase : public internal::dense_xpr_base<Derived>::type
: m_storage(other.derived().rows() * other.derived().cols(), other.derived().rows(), other.derived().cols())
{
_check_template_params();
internal::check_rows_cols_for_overflow((other.derived().rows(), other.derived().cols());
Base::operator=(other.derived());
}
@ -581,6 +603,7 @@ class PlainObjectBase : public internal::dense_xpr_base<Derived>::type
{
eigen_assert(rows >= 0 && (RowsAtCompileTime == Dynamic || RowsAtCompileTime == rows)
&& cols >= 0 && (ColsAtCompileTime == Dynamic || ColsAtCompileTime == cols));
internal::check_rows_cols_for_overflow(rows, cols);
m_storage.resize(rows*cols,rows,cols);
EIGEN_INITIALIZE_BY_ZERO_IF_THAT_OPTION_IS_ENABLED
}
@ -638,6 +661,7 @@ struct internal::conservative_resize_like_impl
if ( ( Derived::IsRowMajor && _this.cols() == cols) || // row-major and we change only the number of rows
(!Derived::IsRowMajor && _this.rows() == rows) ) // column-major and we change only the number of columns
{
internal::check_rows_cols_for_overflow(rows, cols);
_this.derived().m_storage.conservativeResize(rows*cols,rows,cols);
}
else