From 9e962d9c54b8521fbdf287cf41f1ce9e103d9798 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antonio=20S=C3=A1nchez?= <cantonios@google.com>
Date: Tue, 29 Oct 2024 19:07:07 +0000
Subject: [PATCH] Fix OOB access in triangular matrix multiplication.

---
 Eigen/src/Core/products/GeneralMatrixMatrixTriangular.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Eigen/src/Core/products/GeneralMatrixMatrixTriangular.h b/Eigen/src/Core/products/GeneralMatrixMatrixTriangular.h
index 09cda5429..f47615f72 100644
--- a/Eigen/src/Core/products/GeneralMatrixMatrixTriangular.h
+++ b/Eigen/src/Core/products/GeneralMatrixMatrixTriangular.h
@@ -68,6 +68,10 @@ struct general_matrix_matrix_triangular_product<Index, LhsScalar, LhsStorageOrde
                                       const RhsScalar* rhs_, Index rhsStride, ResScalar* res_, Index resIncr,
                                       Index resStride, const ResScalar& alpha,
                                       level3_blocking<LhsScalar, RhsScalar>& blocking) {
+    if (size == 0) {
+      return;
+    }
+
     typedef gebp_traits<LhsScalar, RhsScalar> Traits;
 
     typedef const_blas_data_mapper<LhsScalar, Index, LhsStorageOrder> LhsMapper;