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-rw-r--r--net/sctp/chunk.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 991a530c6b31..d726d213de9a 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -171,6 +171,8 @@ 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);
@@ -189,9 +191,11 @@ 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