libiberty: Check zero value shstrndx in simple-object-elf.c

From-SVN: r273718

libiberty/ChangeLog

+2019-07-12  Ren Kimura  <rkx1209dev@gmail.com>
+
+	* simple-object-elf.c (simple_object_elf_match): Check zero value shstrndx.
+	This fixes a Bug 90924.
+
 2019-07-22  Martin Liska  <mliska@suse.cz>
 
 	* simple-object-elf.c (simple_object_elf_copy_lto_debug_sections):

libiberty/simple-object-elf.c

@@ -548,7 +548,15 @@ simple_object_elf_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
       XDELETE (eor);
       return NULL;
     }
-
+  
+  if (eor->shstrndx == 0)
+    {
+      *errmsg = "invalid ELF shstrndx == 0";
+      *err = 0;
+      XDELETE (eor);
+      return NULL;
+    }
+  
   return (void *) eor;
 }