Re: [PATCH net 1/4] security: pass asoc to sctp_assoc_request and sctp_sk_clone

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On Fri, 2021-10-22 at 02:36 -0400, Xin Long wrote:
> This patch is to move secid and peer_secid from endpoint to
> association,
> and pass asoc to sctp_assoc_request and sctp_sk_clone instead of ep.
> As
> ep is the local endpoint and asoc represents a connection, and in
> SCTP
> one sk/ep could have multiple asoc/connection, saving
> secid/peer_secid
> for new asoc will overwrite the old asoc's.
> 
> Note that since asoc can be passed as NULL,
> security_sctp_assoc_request()
> is moved to the place right after the new_asoc is created in
> sctp_sf_do_5_1B_init() and sctp_sf_do_unexpected_init().
> 
> Fixes: 72e89f50084c ("security: Add support for SCTP security hooks")
> Reported-by: Prashanth Prahlad <pprahlad@xxxxxxxxxx>
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
> ---
>  Documentation/security/SCTP.rst     | 28 ++++++++++++++-------------
> -
>  include/linux/lsm_hook_defs.h       |  4 ++--
>  include/linux/lsm_hooks.h           |  8 ++++----
>  include/linux/security.h            | 10 +++++-----
>  include/net/sctp/structs.h          | 20 ++++++++++----------
>  net/sctp/sm_statefuns.c             | 26 +++++++++++++-------------
>  net/sctp/socket.c                   |  5 ++---
>  security/security.c                 |  8 ++++----
>  security/selinux/hooks.c            | 20 ++++++++++----------
>  security/selinux/include/netlabel.h |  4 ++--
>  security/selinux/netlabel.c         | 14 +++++++-------
>  11 files changed, 73 insertions(+), 74 deletions(-)
> 
> diff --git a/Documentation/security/SCTP.rst
> b/Documentation/security/SCTP.rst
> index 0bcf6c1245ee..415b548d9ce0 100644
> --- a/Documentation/security/SCTP.rst
> +++ b/Documentation/security/SCTP.rst
> @@ -26,11 +26,11 @@ described in the `SCTP SELinux Support`_ chapter.
>  
>  security_sctp_assoc_request()
>  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> -Passes the ``@ep`` and ``@chunk->skb`` of the association INIT
> packet to the
> +Passes the ``@asoc`` and ``@chunk->skb`` of the association INIT
> packet to the
>  security module. Returns 0 on success, error on failure.
>  ::
>  
> -    @ep - pointer to sctp endpoint structure.
> +    @asoc - pointer to sctp association structure.
>      @skb - pointer to skbuff of association packet.
>  
>  
> @@ -117,9 +117,9 @@ Called whenever a new socket is created by
> **accept**\(2)
>  calls **sctp_peeloff**\(3).
>  ::
>  
> -    @ep - pointer to current sctp endpoint structure.
> +    @asoc - pointer to current sctp association structure.
>      @sk - pointer to current sock structure.
> -    @sk - pointer to new sock structure.
> +    @newsk - pointer to new sock structure.
>  
>  
>  security_inet_conn_established()
> @@ -200,22 +200,22 @@ hooks with the SELinux specifics expanded
> below::
>  
>  security_sctp_assoc_request()
>  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> -Passes the ``@ep`` and ``@chunk->skb`` of the association INIT
> packet to the
> +Passes the ``@asoc`` and ``@chunk->skb`` of the association INIT
> packet to the
>  security module. Returns 0 on success, error on failure.
>  ::
>  
> -    @ep - pointer to sctp endpoint structure.
> +    @asoc - pointer to sctp association structure.
>      @skb - pointer to skbuff of association packet.
>  
>  The security module performs the following operations:
> -     IF this is the first association on ``@ep->base.sk``, then set
> the peer
> +     IF this is the first association on ``@asoc->base.sk``, then
> set the peer
>       sid to that in ``@skb``. This will ensure there is only one
> peer sid
> -     assigned to ``@ep->base.sk`` that may support multiple
> associations.
> +     assigned to ``@asoc->base.sk`` that may support multiple
> associations.
>  
> -     ELSE validate the ``@ep->base.sk peer_sid`` against the ``@skb
> peer sid``
> +     ELSE validate the ``@asoc->base.sk peer_sid`` against the
> ``@skb peer sid``
>       to determine whether the association should be allowed or
> denied.
>  
> -     Set the sctp ``@ep sid`` to socket's sid (from ``ep->base.sk``)
> with
> +     Set the sctp ``@asoc sid`` to socket's sid (from ``asoc-
> >base.sk``) with
>       MLS portion taken from ``@skb peer sid``. This will be used by
> SCTP
>       TCP style sockets and peeled off connections as they cause a
> new socket
>       to be generated.
> @@ -259,13 +259,13 @@ security_sctp_sk_clone()
>  Called whenever a new socket is created by **accept**\(2) (i.e. a
> TCP style
>  socket) or when a socket is 'peeled off' e.g userspace calls
>  **sctp_peeloff**\(3). ``security_sctp_sk_clone()`` will set the new
> -sockets sid and peer sid to that contained in the ``@ep sid`` and
> -``@ep peer sid`` respectively.
> +sockets sid and peer sid to that contained in the ``@asoc sid`` and
> +``@asoc peer sid`` respectively.
>  ::
>  
> -    @ep - pointer to current sctp endpoint structure.
> +    @asoc - pointer to current sctp association structure.
>      @sk - pointer to current sock structure.
> -    @sk - pointer to new sock structure.
> +    @newsk - pointer to new sock structure.
>  
>  
>  security_inet_conn_established()
> diff --git a/include/linux/lsm_hook_defs.h
> b/include/linux/lsm_hook_defs.h
> index 2adeea44c0d5..0024273a7382 100644
> --- a/include/linux/lsm_hook_defs.h
> +++ b/include/linux/lsm_hook_defs.h
> @@ -328,11 +328,11 @@ LSM_HOOK(int, 0, tun_dev_create, void)
>  LSM_HOOK(int, 0, tun_dev_attach_queue, void *security)
>  LSM_HOOK(int, 0, tun_dev_attach, struct sock *sk, void *security)
>  LSM_HOOK(int, 0, tun_dev_open, void *security)
> -LSM_HOOK(int, 0, sctp_assoc_request, struct sctp_endpoint *ep,
> +LSM_HOOK(int, 0, sctp_assoc_request, struct sctp_association *asoc,
>          struct sk_buff *skb)
>  LSM_HOOK(int, 0, sctp_bind_connect, struct sock *sk, int optname,
>          struct sockaddr *address, int addrlen)
> -LSM_HOOK(void, LSM_RET_VOID, sctp_sk_clone, struct sctp_endpoint
> *ep,
> +LSM_HOOK(void, LSM_RET_VOID, sctp_sk_clone, struct sctp_association
> *asoc,
>          struct sock *sk, struct sock *newsk)
>  #endif /* CONFIG_SECURITY_NETWORK */
>  
> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> index 5c4c5c0602cb..240b92d89852 100644
> --- a/include/linux/lsm_hooks.h
> +++ b/include/linux/lsm_hooks.h
> @@ -1024,9 +1024,9 @@
>   * Security hooks for SCTP
>   *
>   * @sctp_assoc_request:
> - *     Passes the @ep and @chunk->skb of the association INIT packet
> to
> + *     Passes the @asoc and @chunk->skb of the association INIT
> packet to
>   *     the security module.
> - *     @ep pointer to sctp endpoint structure.
> + *     @asoc pointer to sctp association structure.
>   *     @skb pointer to skbuff of association packet.
>   *     Return 0 on success, error on failure.
>   * @sctp_bind_connect:
> @@ -1044,9 +1044,9 @@
>   *     Called whenever a new socket is created by accept(2) (i.e. a
> TCP
>   *     style socket) or when a socket is 'peeled off' e.g userspace
>   *     calls sctp_peeloff(3).
> - *     @ep pointer to current sctp endpoint structure.
> + *     @asoc pointer to current sctp association structure.
>   *     @sk pointer to current sock structure.
> - *     @sk pointer to new sock structure.
> + *     @newsk pointer to new sock structure.
>   *
>   * Security hooks for Infiniband
>   *
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 5b7288521300..a16407444871 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -179,7 +179,7 @@ struct xfrm_policy;
>  struct xfrm_state;
>  struct xfrm_user_sec_ctx;
>  struct seq_file;
> -struct sctp_endpoint;
> +struct sctp_association;
>  
>  #ifdef CONFIG_MMU
>  extern unsigned long mmap_min_addr;
> @@ -1418,10 +1418,10 @@ int security_tun_dev_create(void);
>  int security_tun_dev_attach_queue(void *security);
>  int security_tun_dev_attach(struct sock *sk, void *security);
>  int security_tun_dev_open(void *security);
> -int security_sctp_assoc_request(struct sctp_endpoint *ep, struct
> sk_buff *skb);
> +int security_sctp_assoc_request(struct sctp_association *asoc,
> struct sk_buff *skb);
>  int security_sctp_bind_connect(struct sock *sk, int optname,
>                                struct sockaddr *address, int
> addrlen);
> -void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock
> *sk,
> +void security_sctp_sk_clone(struct sctp_association *asoc, struct
> sock *sk,
>                             struct sock *newsk);
>  
>  #else  /* CONFIG_SECURITY_NETWORK */
> @@ -1624,7 +1624,7 @@ static inline int security_tun_dev_open(void
> *security)
>         return 0;
>  }
>  
> -static inline int security_sctp_assoc_request(struct sctp_endpoint
> *ep,
> +static inline int security_sctp_assoc_request(struct
> sctp_association *asoc,
>                                               struct sk_buff *skb)
>  {
>         return 0;
> @@ -1637,7 +1637,7 @@ static inline int
> security_sctp_bind_connect(struct sock *sk, int optname,
>         return 0;
>  }
>  
> -static inline void security_sctp_sk_clone(struct sctp_endpoint *ep,
> +static inline void security_sctp_sk_clone(struct sctp_association
> *asoc,
>                                           struct sock *sk,
>                                           struct sock *newsk)
>  {
> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
> index 651bba654d77..899c29c326ba 100644
> --- a/include/net/sctp/structs.h
> +++ b/include/net/sctp/structs.h
> @@ -1355,16 +1355,6 @@ struct sctp_endpoint {
>               reconf_enable:1;
>  
>         __u8  strreset_enable;
> -
> -       /* Security identifiers from incoming (INIT). These are set
> by
> -        * security_sctp_assoc_request(). These will only be used by
> -        * SCTP TCP type sockets and peeled off connections as they
> -        * cause a new socket to be generated.
> security_sctp_sk_clone()
> -        * will then plug these into the new socket.
> -        */
> -
> -       u32 secid;
> -       u32 peer_secid;
>  };
>  
>  /* Recover the outter endpoint structure. */
> @@ -2104,6 +2094,16 @@ struct sctp_association {
>         __u64 abandoned_unsent[SCTP_PR_INDEX(MAX) + 1];
>         __u64 abandoned_sent[SCTP_PR_INDEX(MAX) + 1];
>  
> +       /* Security identifiers from incoming (INIT). These are set
> by
> +        * security_sctp_assoc_request(). These will only be used by
> +        * SCTP TCP type sockets and peeled off connections as they
> +        * cause a new socket to be generated.
> security_sctp_sk_clone()
> +        * will then plug these into the new socket.
> +        */
> +
> +       u32 secid;
> +       u32 peer_secid;
> +
>         struct rcu_head rcu;
>  };
>  
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index fb3da4d8f4a3..3206374209bc 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -326,11 +326,6 @@ enum sctp_disposition
> sctp_sf_do_5_1B_init(struct net *net,
>         struct sctp_packet *packet;
>         int len;
>  
> -       /* Update socket peer label if first association. */
> -       if (security_sctp_assoc_request((struct sctp_endpoint *)ep,
> -                                       chunk->skb))
> -               return sctp_sf_pdiscard(net, ep, asoc, type, arg,
> commands);
> -
>         /* 6.10 Bundling
>          * An endpoint MUST NOT bundle INIT, INIT ACK or
>          * SHUTDOWN COMPLETE with any other chunks.
> @@ -415,6 +410,12 @@ enum sctp_disposition
> sctp_sf_do_5_1B_init(struct net *net,
>         if (!new_asoc)
>                 goto nomem;
>  
> +       /* Update socket peer label if first association. */
> +       if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
> +               sctp_association_free(new_asoc);
> +               return sctp_sf_pdiscard(net, ep, asoc, type, arg,
> commands);
> +       }
> +
>         if (sctp_assoc_set_bind_addr_from_ep(new_asoc,
>                                             
> sctp_scope(sctp_source(chunk)),
>                                              GFP_ATOMIC) < 0)
> @@ -780,7 +781,6 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct
> net *net,
>                 }
>         }
>  
> -
>         /* Delay state machine commands until later.
>          *
>          * Re-build the bind address for the association is done in
> @@ -1517,11 +1517,6 @@ static enum sctp_disposition
> sctp_sf_do_unexpected_init(
>         struct sctp_packet *packet;
>         int len;
>  
> -       /* Update socket peer label if first association. */
> -       if (security_sctp_assoc_request((struct sctp_endpoint *)ep,
> -                                       chunk->skb))
> -               return sctp_sf_pdiscard(net, ep, asoc, type, arg,
> commands);
> -
>         /* 6.10 Bundling
>          * An endpoint MUST NOT bundle INIT, INIT ACK or
>          * SHUTDOWN COMPLETE with any other chunks.
> @@ -1594,6 +1589,12 @@ static enum sctp_disposition
> sctp_sf_do_unexpected_init(
>         if (!new_asoc)
>                 goto nomem;
>  
> +       /* Update socket peer label if first association. */
> +       if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
> +               sctp_association_free(new_asoc);
> +               return sctp_sf_pdiscard(net, ep, asoc, type, arg,
> commands);
> +       }
> +
>         if (sctp_assoc_set_bind_addr_from_ep(new_asoc,
>                                 sctp_scope(sctp_source(chunk)),
> GFP_ATOMIC) < 0)
>                 goto nomem;
> @@ -2255,8 +2256,7 @@ enum sctp_disposition sctp_sf_do_5_2_4_dupcook(
>         }
>  
>         /* Update socket peer label if first association. */
> -       if (security_sctp_assoc_request((struct sctp_endpoint *)ep,
> -                                       chunk->skb)) {
> +       if (security_sctp_assoc_request(new_asoc, chunk->skb)) {
>                 sctp_association_free(new_asoc);
>                 return sctp_sf_pdiscard(net, ep, asoc, type, arg,
> commands);
>         }
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 6b937bfd4751..33391254fa82 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -9412,7 +9412,6 @@ void sctp_copy_sock(struct sock *newsk, struct
> sock *sk,
>         struct inet_sock *inet = inet_sk(sk);
>         struct inet_sock *newinet;
>         struct sctp_sock *sp = sctp_sk(sk);
> -       struct sctp_endpoint *ep = sp->ep;
>  
>         newsk->sk_type = sk->sk_type;
>         newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
> @@ -9457,9 +9456,9 @@ void sctp_copy_sock(struct sock *newsk, struct
> sock *sk,
>                 net_enable_timestamp();
>  
>         /* Set newsk security attributes from original sk and
> connection
> -        * security attribute from ep.
> +        * security attribute from asoc.
>          */
> -       security_sctp_sk_clone(ep, sk, newsk);
> +       security_sctp_sk_clone(asoc, sk, newsk);
>  }
>  
>  static inline void sctp_copy_descendant(struct sock *sk_to,
> diff --git a/security/security.c b/security/security.c
> index 9ffa9e9c5c55..b0f1c007aa3b 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -2366,9 +2366,9 @@ int security_tun_dev_open(void *security)
>  }
>  EXPORT_SYMBOL(security_tun_dev_open);
>  
> -int security_sctp_assoc_request(struct sctp_endpoint *ep, struct
> sk_buff *skb)
> +int security_sctp_assoc_request(struct sctp_association *asoc,
> struct sk_buff *skb)
>  {
> -       return call_int_hook(sctp_assoc_request, 0, ep, skb);
> +       return call_int_hook(sctp_assoc_request, 0, asoc, skb);
>  }
>  EXPORT_SYMBOL(security_sctp_assoc_request);
>  
> @@ -2380,10 +2380,10 @@ int security_sctp_bind_connect(struct sock
> *sk, int optname,
>  }
>  EXPORT_SYMBOL(security_sctp_bind_connect);
>  
> -void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock
> *sk,
> +void security_sctp_sk_clone(struct sctp_association *asoc, struct
> sock *sk,
>                             struct sock *newsk)
>  {
> -       call_void_hook(sctp_sk_clone, ep, sk, newsk);
> +       call_void_hook(sctp_sk_clone, asoc, sk, newsk);
>  }
>  EXPORT_SYMBOL(security_sctp_sk_clone);
>  
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index e7ebd45ca345..f025fc00421b 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -5356,10 +5356,10 @@ static void selinux_sock_graft(struct sock
> *sk, struct socket *parent)
>   * connect(2), sctp_connectx(3) or sctp_sendmsg(3) (with no
> association
>   * already present).
>   */
> -static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
> +static int selinux_sctp_assoc_request(struct sctp_association *asoc,
>                                       struct sk_buff *skb)
>  {
> -       struct sk_security_struct *sksec = ep->base.sk->sk_security;
> +       struct sk_security_struct *sksec = asoc->base.sk-
> >sk_security;
>         struct common_audit_data ad;
>         struct lsm_network_audit net = {0,};
>         u8 peerlbl_active;
> @@ -5376,7 +5376,7 @@ static int selinux_sctp_assoc_request(struct
> sctp_endpoint *ep,
>                 /* This will return peer_sid = SECSID_NULL if there
> are
>                  * no peer labels, see
> security_net_peersid_resolve().
>                  */
> -               err = selinux_skb_peerlbl_sid(skb, ep->base.sk-
> >sk_family,
> +               err = selinux_skb_peerlbl_sid(skb, asoc->base.sk-
> >sk_family,
>                                               &peer_sid);
>                 if (err)
>                         return err;
> @@ -5400,7 +5400,7 @@ static int selinux_sctp_assoc_request(struct
> sctp_endpoint *ep,
>                  */
>                 ad.type = LSM_AUDIT_DATA_NET;
>                 ad.u.net = &net;
> -               ad.u.net->sk = ep->base.sk;
> +               ad.u.net->sk = asoc->base.sk;
>                 err = avc_has_perm(&selinux_state,
>                                    sksec->peer_sid, peer_sid, sksec-
> >sclass,
>                                    SCTP_SOCKET__ASSOCIATION, &ad);
> @@ -5418,11 +5418,11 @@ static int selinux_sctp_assoc_request(struct
> sctp_endpoint *ep,

I found another nit where ep needs changing:

diff -ur a/security/selinux/hooks.c b/security/selinux/hooks.c
--- a/security/selinux/hooks.c	2021-10-22 12:29:23.771796000 +0100
+++ b/security/selinux/hooks.c	2021-10-23 09:39:40.514988202 +0100
@@ -5409,7 +5409,7 @@
 	}
 
 	/* Compute the MLS component for the connection and store
-	 * the information in ep. This will be used by SCTP TCP type
+	 * the information in asoc. This will be used by SCTP TCP type
 	 * sockets and peeled off connections as they cause a new
 	 * socket to be generated. selinux_sctp_sk_clone() will then
 	 * plug this into the new socket.





>         if (err)
>                 return err;
>  
> -       ep->secid = conn_sid;
> -       ep->peer_secid = peer_sid;
> +       asoc->secid = conn_sid;
> +       asoc->peer_secid = peer_sid;
>  
>         /* Set any NetLabel labels including CIPSO/CALIPSO options. */
> -       return selinux_netlbl_sctp_assoc_request(ep, skb);
> +       return selinux_netlbl_sctp_assoc_request(asoc, skb);
>  }
>  
>  /* Check if sctp IPv4/IPv6 addresses are valid for binding or
> connecting
> @@ -5507,7 +5507,7 @@ static int selinux_sctp_bind_connect(struct sock
> *sk, int optname,
>  }
>  
>  /* Called whenever a new socket is created by accept(2) or
> sctp_peeloff(3). */
> -static void selinux_sctp_sk_clone(struct sctp_endpoint *ep, struct
> sock *sk,
> +static void selinux_sctp_sk_clone(struct sctp_association *asoc,
> struct sock *sk,
>                                   struct sock *newsk)
>  {
>         struct sk_security_struct *sksec = sk->sk_security;
> @@ -5519,8 +5519,8 @@ static void selinux_sctp_sk_clone(struct
> sctp_endpoint *ep, struct sock *sk,
>         if (!selinux_policycap_extsockclass())
>                 return selinux_sk_clone_security(sk, newsk);
>  
> -       newsksec->sid = ep->secid;
> -       newsksec->peer_sid = ep->peer_secid;
> +       newsksec->sid = asoc->secid;
> +       newsksec->peer_sid = asoc->peer_secid;
>         newsksec->sclass = sksec->sclass;
>         selinux_netlbl_sctp_sk_clone(sk, newsk);
>  }
> diff --git a/security/selinux/include/netlabel.h
> b/security/selinux/include/netlabel.h
> index 0c58f62dc6ab..4d0456d3d459 100644
> --- a/security/selinux/include/netlabel.h
> +++ b/security/selinux/include/netlabel.h
> @@ -39,7 +39,7 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
>  int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
>                                  u16 family,
>                                  u32 sid);
> -int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
> +int selinux_netlbl_sctp_assoc_request(struct sctp_association *asoc,
>                                      struct sk_buff *skb);
>  int selinux_netlbl_inet_conn_request(struct request_sock *req, u16
> family);
>  void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family);
> @@ -98,7 +98,7 @@ static inline int selinux_netlbl_skbuff_setsid(struct
> sk_buff *skb,
>         return 0;
>  }
>  
> -static inline int selinux_netlbl_sctp_assoc_request(struct
> sctp_endpoint *ep,
> +static inline int selinux_netlbl_sctp_assoc_request(struct
> sctp_association *asoc,
>                                                     struct sk_buff
> *skb)
>  {
>         return 0;
> diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
> index abaab7683840..43d72f776a7d 100644
> --- a/security/selinux/netlabel.c
> +++ b/security/selinux/netlabel.c
> @@ -268,22 +268,22 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff
> *skb,
>   * Returns zero on success, negative values on failure.
>   *
>   */
> -int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep,
> +int selinux_netlbl_sctp_assoc_request(struct sctp_association *asoc,
>                                      struct sk_buff *skb)
>  {
>         int rc;
>         struct netlbl_lsm_secattr secattr;
> -       struct sk_security_struct *sksec = ep->base.sk->sk_security;
> +       struct sk_security_struct *sksec = asoc->base.sk->sk_security;
>         struct sockaddr_in addr4;
>         struct sockaddr_in6 addr6;
>  
> -       if (ep->base.sk->sk_family != PF_INET &&
> -                               ep->base.sk->sk_family != PF_INET6)
> +       if (asoc->base.sk->sk_family != PF_INET &&
> +           asoc->base.sk->sk_family != PF_INET6)
>                 return 0;
>  
>         netlbl_secattr_init(&secattr);
>         rc = security_netlbl_sid_to_secattr(&selinux_state,
> -                                           ep->secid, &secattr);
> +                                           asoc->secid, &secattr);
>         if (rc != 0)
>                 goto assoc_request_return;
>  
> @@ -293,11 +293,11 @@ int selinux_netlbl_sctp_assoc_request(struct
> sctp_endpoint *ep,
>         if (ip_hdr(skb)->version == 4) {
>                 addr4.sin_family = AF_INET;
>                 addr4.sin_addr.s_addr = ip_hdr(skb)->saddr;
> -               rc = netlbl_conn_setattr(ep->base.sk, (void *)&addr4,
> &secattr);
> +               rc = netlbl_conn_setattr(asoc->base.sk, (void *)&addr4,
> &secattr);
>         } else if (IS_ENABLED(CONFIG_IPV6) && ip_hdr(skb)->version ==
> 6) {
>                 addr6.sin6_family = AF_INET6;
>                 addr6.sin6_addr = ipv6_hdr(skb)->saddr;
> -               rc = netlbl_conn_setattr(ep->base.sk, (void *)&addr6,
> &secattr);
> +               rc = netlbl_conn_setattr(asoc->base.sk, (void *)&addr6,
> &secattr);
>         } else {
>                 rc = -EAFNOSUPPORT;
>         }




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