[MPTCP] [PATCH v3 06/10] Fix return value if no DSS option is created.

[Peter Krystad <peter.krystad at linux.intel.com>]

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Strictly speaking mptcp_established_options_dss() should
return false if no DSS option is created.

squashto: Write MPTCP DSS headers to outgoing data packets

Signed-off-by: Peter Krystad <peter.krystad(a)linux.intel.com>
---
 net/mptcp/options.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 1f54c543304e..01f59ad629e5 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -400,6 +400,9 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
 		WARN(1, "MPTCP: Ack dropped");
 	}
 
+	if (!dss_size)
+		return false;
+
 	*size = ALIGN(dss_size, 4);
 	return true;
 }
-- 
2.17.2