ovl: port ovl_get_link() to cred guard

Use the scoped ovl cred guard.

Link: https://patch.msgid.link/20251117-work-ovl-cred-guard-v4-16-b31603935724@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 7dbf6cf2252df39a346122d368585ee6137a2cc0..31e4fb14ac13fee86cc7cd98e7023a46704b5ec7 100644 (file)
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -325,16 +325,11 @@ static const char *ovl_get_link(struct dentry *dentry,
                                struct inode *inode,
                                struct delayed_call *done)
 {
-       const struct cred *old_cred;
-       const char *p;
-
        if (!dentry)
                return ERR_PTR(-ECHILD);
 
-       old_cred = ovl_override_creds(dentry->d_sb);
-       p = vfs_get_link(ovl_dentry_real(dentry), done);
-       ovl_revert_creds(old_cred);
-       return p;
+       with_ovl_creds(dentry->d_sb)
+               return vfs_get_link(ovl_dentry_real(dentry), done);
 }
 
 #ifdef CONFIG_FS_POSIX_ACL