fs/ext2: Fix a file not found error when a symlink filesize is equal to 60

We encountered a file not found error when the symlink filesize is
equal to 60:

  $ ls -l initrd
  lrwxrwxrwx 1 root root 60 Jan  6 16:37 initrd -> secure-core-image-initramfs-5.10.2-yoctodev-standard.cpio.gz

When booting, we got the following error in the GRUB:

  error: file `/initrd' not found

The root cause is that the size of diro->inode.symlink is equal to 60
and a symlink name has to be terminated with NUL there. So, if the
symlink filesize is exactly 60 then it is also stored in a separate
block rather than in the inode itself.

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/fs/ext2.c

@@ -729,10 +729,11 @@ grub_ext2_read_symlink (grub_fshelp_node_t node)
   if (! symlink)
     return 0;
 
-  /* If the filesize of the symlink is bigger than
+  /*
-     60 the symlink is stored in a separate block,
+   * If the filesize of the symlink is equal to or bigger than 60 the symlink
-     otherwise it is stored in the inode.  */
+   * is stored in a separate block, otherwise it is stored in the inode.
-  if (grub_le_to_cpu32 (diro->inode.size) <= sizeof (diro->inode.symlink))
+   */
+  if (grub_le_to_cpu32 (diro->inode.size) < sizeof (diro->inode.symlink))
     grub_memcpy (symlink,
 		 diro->inode.symlink,
 		 grub_le_to_cpu32 (diro->inode.size));