# HG changeset patch
# User Rik <rik@octave.org>
# Date 1588116232 25200
# Node ID 9646d752c76c1ceed960dc4f9dfe7727be75fe4c
# Parent  50d83252f867919d33c3223117de6cc9959d3c17
Fix segfault when loading a single string from an hdf5 file (bug #58268).

* ov-str-mat.cc (load_hdf5): Declare OCTAVE_LOCAL_BUFFER to be slen+1 to handle
the null termination byte.  Remove FIXME questioning whether rank 0 strings
exist in HDF5 format, they do.

diff -r 50d83252f867 -r 9646d752c76c libinterp/octave-value/ov-str-mat.cc
--- a/libinterp/octave-value/ov-str-mat.cc	Fri Apr 24 13:04:08 2020 -0700
+++ b/libinterp/octave-value/ov-str-mat.cc	Tue Apr 28 16:23:52 2020 -0700
@@ -680,9 +680,8 @@
     }
   else
     {
-      // This is cruft for backward compatibility and easy data
-      // importation
-      if (rank == 0) //FIXME: Does rank==0 even exist for strings in HDF5?
+      // This is cruft for backward compatibility and easy data importation
+      if (rank == 0)
         {
           // a single string:
           int slen = H5Tget_size (type_hid);
@@ -695,9 +694,8 @@
             }
           else
             {
-              OCTAVE_LOCAL_BUFFER (char, s, slen);
-              // create datatype for (null-terminated) string
-              // to read into:
+              OCTAVE_LOCAL_BUFFER (char, s, slen+1);
+              // create datatype for (null-terminated) string to read into:
               hid_t st_id = H5Tcopy (H5T_C_S1);
               H5Tset_size (st_id, slen+1);
               if (H5Dread (data_hid, st_id, octave_H5S_ALL,