Comment 25 for bug 1857257

Yeah, that patch is buggy and I think this might've been my fault actually. The fix should be:

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 9d16fff5342a..fbec523a67c9 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -42,6 +42,7 @@ static struct file *ovl_open_realfile(const struct file *file,
        int flags = file->f_flags | O_NOATIME | FMODE_NONOTIFY;

        old_cred = ovl_override_creds(inode->i_sb);
+ ovl_path_real(file->f_path.dentry, &realpath);
        if (realpath.dentry->d_sb->s_magic == SHIFTFS_MAGIC)
                realfile = open_with_fake_path(&realpath, flags, realinode,
                                               current_cred());