X-Git-Url: https://glassweightruler.freedombox.rocks/gitweb/Ventoy.git/blobdiff_plain/d551fc2e3ca74e4678c744f86c1e8f5e191f624b..d5b829f8e8c8367b032b4bb57a8fc37701d42e17:/GRUB2/grub-2.04/grub-core/fs/fat.c

diff --git a/GRUB2/grub-2.04/grub-core/fs/fat.c b/GRUB2/grub-2.04/grub-core/fs/fat.c
index 2b26a8c..6338d49 100644
--- a/GRUB2/grub-2.04/grub-core/fs/fat.c
+++ b/GRUB2/grub-2.04/grub-core/fs/fat.c
@@ -558,7 +558,7 @@ grub_fat_read_data (grub_disk_t disk, grub_fshelp_node_t node,
 	  if (next_cluster >= node->data->cluster_eof_mark)
 	    return ret;
 
-	  if (next_cluster < 2 || next_cluster >= node->data->num_clusters)
+	  if (next_cluster < 2 || (next_cluster - 2) >= node->data->num_clusters)
 	    {
 	      grub_error (GRUB_ERR_BAD_FS, "invalid cluster %u",
 			  next_cluster);
@@ -1409,7 +1409,7 @@ int grub_fat_get_file_chunk(grub_uint64_t part_start, grub_file_t file, ventoy_i
                 return 0;
             }
 
-            if (next_cluster < 2 || next_cluster >= node->data->num_clusters)
+            if (next_cluster < 2 || (next_cluster - 2) >= node->data->num_clusters)
             {
                 grub_error (GRUB_ERR_BAD_FS, "invalid cluster %u", next_cluster);
                 return -1;