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Fix nullptr dereference in SVD.

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This commit is contained in:
Antonio Sánchez 2023-08-01 16:33:16 +00:00 committed by Rasmus Munk Larsen
parent 86a43d8c04
commit 2af700aa40
1 changed files with 6 additions and 2 deletions
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8
Eigen/src/SVD/UpperBidiagonalization.h
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@ -341,11 +341,15 @@ void upperbidiagonalization_inplace_blocked(MatrixType& A, BidiagType& bidiagona
// Finally, the algorithm continue on the updated A22.
//
// However, if B is too small, or A22 empty, then let's use an unblocked strategy
auto upper_diagonal = bidiagonal.template diagonal<1>();
typename MatrixType::RealScalar* upper_diagonal_ptr = upper_diagonal.size() > 0 ? &upper_diagonal.coeffRef(k) : nullptr;
if(k+bs==cols || bcols<48) // somewhat arbitrary threshold
{
upperbidiagonalization_inplace_unblocked(B,
&(bidiagonal.template diagonal<0>().coeffRef(k)),
&(bidiagonal.template diagonal<1>().coeffRef(k)),
upper_diagonal_ptr,
X.data()
);
break; // We're done
@ -354,7 +358,7 @@ void upperbidiagonalization_inplace_blocked(MatrixType& A, BidiagType& bidiagona
{
upperbidiagonalization_blocked_helper<BlockType>( B,
&(bidiagonal.template diagonal<0>().coeffRef(k)),
&(bidiagonal.template diagonal<1>().coeffRef(k)),
upper_diagonal_ptr,
bs,
X.topLeftCorner(brows,bs),
Y.topLeftCorner(bcols,bs)