Merge tag 'selinux-pr-20180403' of git://git.kernel.org/pub/scm/linux/kernel/git...

[uclinux-h8/linux.git] / net / sctp / chunk.c

diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index f889a84..be296d6 100644 (file)
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -172,6 +172,8 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
        struct list_head *pos, *temp;
        struct sctp_chunk *chunk;
        struct sctp_datamsg *msg;
+       struct sctp_sock *sp;
+       struct sctp_af *af;
        int err;
 
        msg = sctp_datamsg_new(GFP_KERNEL);
@@ -190,9 +192,11 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
        /* This is the biggest possible DATA chunk that can fit into
         * the packet
         */
-       max_data = asoc->pathmtu -
-                  sctp_sk(asoc->base.sk)->pf->af->net_header_len -
-                  sizeof(struct sctphdr) - sctp_datachk_len(&asoc->stream);
+       sp = sctp_sk(asoc->base.sk);
+       af = sp->pf->af;
+       max_data = asoc->pathmtu - af->net_header_len -
+                  sizeof(struct sctphdr) - sctp_datachk_len(&asoc->stream) -
+                  af->ip_options_len(asoc->base.sk);
        max_data = SCTP_TRUNC4(max_data);
 
        /* If the the peer requested that we authenticate DATA chunks