[7645] check null in get_tags_of_indirect_tags_table

[gavinsmith0123]

Revision: 7645
          http://svn.sv.gnu.org/viewvc/?view=rev&root=texinfo&revision=7645
Author:   gavin
Date:     2017-01-21 15:32:23 -0500 (Sat, 21 Jan 2017)
Log Message:
-----------
check null in get_tags_of_indirect_tags_table

Modified Paths:
--------------
    trunk/ChangeLog
    trunk/info/nodes.c

Modified: trunk/ChangeLog
===================================================================
--- trunk/ChangeLog     2017-01-21 18:07:22 UTC (rev 7644)
+++ trunk/ChangeLog     2017-01-21 20:32:23 UTC (rev 7645)
@@ -1,5 +1,11 @@
 2017-01-21  Gavin Smith  <address@hidden>
 
+       * info/nodes.c (get_tags_of_indirect_tags_table): Check if 
+       'tags' field of file buffer record is null.  This avoids 
+       dereferencing a null pointer.  (Report from Hanno B\xF6ck.)
+
+2017-01-21  Gavin Smith  <address@hidden>
+
        * tp/Texinfo/Convert/HTML.pm (_file_header_information):
        Place name of manual in parentheses after the name of the page, 
        instead of before it.  This is so that if several pages from a 

Modified: trunk/info/nodes.c
===================================================================
--- trunk/info/nodes.c  2017-01-21 18:07:22 UTC (rev 7644)
+++ trunk/info/nodes.c  2017-01-21 20:32:23 UTC (rev 7645)
@@ -356,6 +356,8 @@
   /* First get the list of tags from the tags table.  Then lookup the
      associated file in the indirect list for each tag, and update it. */
   get_nodes_of_tags_table (file_buffer, tags_binding);
+  if (!file_buffer->tags)
+    return;
 
   /* We have the list of tags in file_buffer->tags.  Get the list of
      subfiles from the indirect table. */