grub2/0288-blscfg-don-t-use-grub_list_t-and-the-GRUB_AS_LIST-ma.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Fri, 22 Mar 2019 11:14:26 +0100
Subject: [PATCH] blscfg: don't use grub_list_t and the GRUB_AS_LIST() macro

We are not using GRUB's list functions anyways since we want to add new
items in the middle ot the list but GRUB's grub_list_push() only allows
to add new items at the beginning of the list. So don't use grub_list_t
and GRUB_AS_LIST() macro and just reference struct bls_entry * directly.

We can't change GRUB lists API because we want the blscfg module to not
need external symbols so it can be updated without updating GRUB's core.

This also solves a bug where the struct bls_entry .next field wasn't set
correctly which caused some entries to not be populated in the grub menu.

Resolves: rhbz#1691232

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
 grub-core/commands/blscfg.c | 10 +++++-----
 include/grub/menu.h         |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
index 5635066e3eb..bb93b7f4904 100644
--- a/grub-core/commands/blscfg.c
+++ b/grub-core/commands/blscfg.c
@@ -350,13 +350,13 @@ static int bls_cmp(const struct bls_entry *e0, const struct bls_entry *e1)
   return r;
 }
 
-static void list_add_tail(grub_list_t head, grub_list_t item)
+static void list_add_tail(struct bls_entry *head, struct bls_entry *item)
 {
   item->next = head;
   if (head->prev)
-    (*head->prev)->next = item;
+    head->prev->next = item;
   item->prev = head->prev;
-  head->prev = &item;
+  head->prev = item;
 }
 
 static int bls_add_entry(struct bls_entry *entry)
@@ -378,7 +378,7 @@ static int bls_add_entry(struct bls_entry *entry)
 
     if (rc == 1) {
       grub_dprintf ("blscfg", "Add entry with id \"%s\"\n", entry->filename);
-      list_add_tail (GRUB_AS_LIST (e), GRUB_AS_LIST (entry));
+      list_add_tail (e, entry);
       if (e == entries) {
 	entries = entry;
 	entry->prev = NULL;
@@ -391,7 +391,7 @@ static int bls_add_entry(struct bls_entry *entry)
   if (last) {
     grub_dprintf ("blscfg", "Add entry with id \"%s\"\n", entry->filename);
     last->next = entry;
-    entry->prev = &last;
+    entry->prev = last;
   }
 
   return 0;
diff --git a/include/grub/menu.h b/include/grub/menu.h
index eea493f74b1..0acdc2aa6bf 100644
--- a/include/grub/menu.h
+++ b/include/grub/menu.h
@@ -23,7 +23,7 @@
 struct bls_entry
 {
   struct bls_entry *next;
-  struct bls_entry **prev;
+  struct bls_entry *prev;
   struct keyval **keyvals;
   int nkeyvals;
   char *filename;