Fix a memory corruption issue in H5S__point_project_simple (HDFGroup#…

…2626)

release_docs/RELEASE.txt

@@ -205,6 +205,20 @@ Bug Fixes since HDF5-1.12.1 release
 ===================================
     Library
     -------
+    - Fixed a memory corruption issue that can occur when reading
+      from a dataset using a hyperslab selection in the file
+      dataspace and a point selection in the memory dataspace
+
+      When reading from a dataset using a hyperslab selection in
+      the dataset's file dataspace and a point selection in the
+      dataset's memory dataspace where the file dataspace's "rank"
+      is greater than the memory dataspace's "rank", memory corruption
+      could occur due to an incorrect number of selection points
+      being copied when projecting the point selection onto the
+      hyperslab selection's dataspace.
+
+      (JTH - 2023/03/23)
+
     - Seg fault on file close
 
       h5debug fails at file close with core dump on a file that has an

src/H5Spoint.c

@@ -2316,7 +2316,7 @@ H5S__point_project_simple(const H5S_t *base_space, H5S_t *new_space, hsize_t *of
             /* Copy over the point's coordinates */
             HDmemset(new_node->pnt, 0, sizeof(hsize_t) * rank_diff);
             H5MM_memcpy(&new_node->pnt[rank_diff], base_node->pnt,
-                        (new_space->extent.rank * sizeof(hsize_t)));
+                        (base_space->extent.rank * sizeof(hsize_t)));
 
             /* Keep the order the same when copying */
             if (NULL == prev_node)