From c29a4101164be8c8ff5c8cefdb1f29d66fe42bc0 Mon Sep 17 00:00:00 2001
From: Charles Schlosser <cs.schlosser@gmail.com>
Date: Fri, 12 Jan 2024 06:09:46 +0000
Subject: [PATCH] check pointers before freeing

---
 Eigen/src/Core/util/Memory.h | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h
index 31f1057ee..62534540c 100644
--- a/Eigen/src/Core/util/Memory.h
+++ b/Eigen/src/Core/util/Memory.h
@@ -156,7 +156,7 @@ EIGEN_DEVICE_FUNC inline void* handmade_aligned_malloc(std::size_t size,
 
 /** \internal Frees memory allocated with handmade_aligned_malloc */
 EIGEN_DEVICE_FUNC inline void handmade_aligned_free(void* ptr) {
-  if (ptr) {
+  if (ptr != nullptr) {
     uint8_t offset = static_cast<uint8_t>(*(static_cast<uint8_t*>(ptr) - 1));
     void* original = static_cast<void*>(static_cast<uint8_t*>(ptr) - offset);
 
@@ -224,9 +224,11 @@ EIGEN_DEVICE_FUNC inline void* aligned_malloc(std::size_t size) {
 EIGEN_DEVICE_FUNC inline void aligned_free(void* ptr) {
 #if (EIGEN_DEFAULT_ALIGN_BYTES == 0) || EIGEN_MALLOC_ALREADY_ALIGNED
 
-  if (ptr) check_that_malloc_is_allowed();
-  EIGEN_USING_STD(free)
-  free(ptr);
+  if (ptr != nullptr) {
+    check_that_malloc_is_allowed();
+    EIGEN_USING_STD(free)
+    free(ptr);
+  }
 
 #else
   handmade_aligned_free(ptr);
@@ -294,9 +296,11 @@ EIGEN_DEVICE_FUNC inline void conditional_aligned_free(void* ptr) {
 
 template <>
 EIGEN_DEVICE_FUNC inline void conditional_aligned_free<false>(void* ptr) {
-  if (ptr) check_that_malloc_is_allowed();
-  EIGEN_USING_STD(free)
-  free(ptr);
+  if (ptr != nullptr) {
+    check_that_malloc_is_allowed();
+    EIGEN_USING_STD(free)
+    free(ptr);
+  }
 }
 
 template <bool Align>