commit 93ec5e23766a9f75aa4950748cf73964028a8d1b
Author: Andreas Krebbel <krebbel@linux.vnet.ibm.com>
Date:   Mon Jun 26 11:01:58 2017 +0200

    S/390: Fix testsuite segfault added with recent pgste patch.
    
    The recent pgste patch caused several testcases to fail with a
    segfault.  Fixed with this patch by adding NULL pointer checks.
    
    regression-tested on s390x.
    
    bfd/ChangeLog:
    
    2017-06-26  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
    
            * elf64-s390.c (elf_s390_additional_program_headers): Add NULL
            pointer checks.
            (elf_s390_modify_segment_map): Likewise.
            (bfd_elf_s390_set_options): Lisewise.

### a/bfd/ChangeLog
### b/bfd/ChangeLog
## -1,3 +1,10 @@
+2017-06-26  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
+	* elf64-s390.c (elf_s390_additional_program_headers): Add NULL
+	pointer checks.
+	(elf_s390_modify_segment_map): Likewise.
+	(bfd_elf_s390_set_options): Lisewise.
+
 2017-06-26  Alan Modra  <amodra@gmail.com>
 
 	* elflink.c (_bfd_elf_link_create_dynstrtab): Don't make dynobj
--- a/bfd/elf64-s390.c
+++ b/bfd/elf64-s390.c
@@ -3978,22 +3978,29 @@ elf_s390_additional_program_headers (bfd *abfd ATTRIBUTE_UNUSED,
 {
   struct elf_s390_link_hash_table *htab;
 
-  htab = elf_s390_hash_table (info);
-  return htab->params->pgste;
+  if (info)
+    {
+      htab = elf_s390_hash_table (info);
+      if (htab)
+	return htab->params->pgste;
+    }
+  return 0;
 }
 
 
 /* Add the PT_S390_PGSTE program header.  */
 
 static bfd_boolean
-elf_s390_modify_segment_map (bfd *abfd ATTRIBUTE_UNUSED,
-			     struct bfd_link_info *info)
+elf_s390_modify_segment_map (bfd *abfd, struct bfd_link_info *info)
 {
   struct elf_s390_link_hash_table *htab;
   struct elf_segment_map *m, *pm = NULL;
 
+  if (!abfd || !info)
+    return TRUE;
+
   htab = elf_s390_hash_table (info);
-  if (!htab->params->pgste)
+  if (!htab || !htab->params->pgste)
     return TRUE;
 
   /* If there is already a PT_S390_PGSTE header, avoid adding
@@ -4027,8 +4034,12 @@ bfd_elf_s390_set_options (struct bfd_link_info *info,
 {
   struct elf_s390_link_hash_table *htab;
 
-  htab = elf_s390_hash_table (info);
-  htab->params = params;
+  if (info)
+    {
+      htab = elf_s390_hash_table (info);
+      if (htab)
+	htab->params = params;
+    }
 
   return TRUE;
 }