grub2/0001-fs-xfs-always-verify-the-total-number-of-entries-is-.patch

From 045aae8fe7238aabc217700df4d17d83b7d891f3 Mon Sep 17 00:00:00 2001
From: Michael Chang <mchang@suse.com>
Date: Tue, 23 Jan 2024 12:46:16 +0800
Subject: [PATCH] fs/xfs: always verify the total number of entries is not zero

---
 grub-core/fs/xfs.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/grub-core/fs/xfs.c b/grub-core/fs/xfs.c
index bc2224dbb..1ce5fa4fc 100644
--- a/grub-core/fs/xfs.c
+++ b/grub-core/fs/xfs.c
@@ -900,6 +900,8 @@ grub_xfs_iterate_dir (grub_fshelp_node_t dir,
 	  {
 	    struct grub_xfs_dir2_entry *direntry =
 					grub_xfs_first_de(dir->data, dirblock);
+	    struct grub_xfs_dirblock_tail *tail = grub_xfs_dir_tail (dir->data, dirblock);
+
 	    int entries = -1;
 	    char *end = dirblock + dirblk_size;
 
@@ -918,18 +920,16 @@ grub_xfs_iterate_dir (grub_fshelp_node_t dir,
 	     */
 	    if (dir->inode.nextents == grub_cpu_to_be32_compile_time (1))
 	      {
-		struct grub_xfs_dirblock_tail *tail = grub_xfs_dir_tail (dir->data, dirblock);
-
 		end = (char *) tail;
 
 		/* Subtract the space used by leaf nodes. */
 		end -= grub_be_to_cpu32 (tail->leaf_count) * sizeof (struct grub_xfs_dir_leaf_entry);
+	      }
 
-		entries = grub_be_to_cpu32 (tail->leaf_count) - grub_be_to_cpu32 (tail->leaf_stale);
+	    entries = grub_be_to_cpu32 (tail->leaf_count) - grub_be_to_cpu32 (tail->leaf_stale);
 
-		if (!entries)
-		  continue;
-	      }
+	    if (!entries)
+	      continue;
 
 	    /* Iterate over all entries within this block.  */
 	    while ((char *) direntry < (char *) end)
-- 
2.43.0