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-rw-r--r--net/mptcp/options.c5
-rw-r--r--net/mptcp/protocol.h3
2 files changed, 5 insertions, 3 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index c9643344a8d7..17ad42c65087 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -699,10 +699,11 @@ static bool mptcp_established_options_mp_prio(struct sock *sk,
if (!subflow->send_mp_prio)
return false;
- if (remaining < TCPOLEN_MPTCP_PRIO)
+ /* account for the trailing 'nop' option */
+ if (remaining < TCPOLEN_MPTCP_PRIO_ALIGN)
return false;
- *size = TCPOLEN_MPTCP_PRIO;
+ *size = TCPOLEN_MPTCP_PRIO_ALIGN;
opts->suboptions |= OPTION_MPTCP_PRIO;
opts->backup = subflow->request_bkup;
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 1460705aaad0..07ee319f7847 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -60,7 +60,8 @@
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24
#define TCPOLEN_MPTCP_PORT_LEN 4
#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
-#define TCPOLEN_MPTCP_PRIO 4
+#define TCPOLEN_MPTCP_PRIO 3
+#define TCPOLEN_MPTCP_PRIO_ALIGN 4
#define TCPOLEN_MPTCP_FASTCLOSE 12
/* MPTCP MP_JOIN flags */