diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c
index f4034e000..44d083958 100755
--- a/net/mptcp/mib.c
+++ b/net/mptcp/mib.c
@@ -23,6 +23,8 @@ static const struct snmp_mib mptcp_snmp_list[] = {
 	SNMP_MIB_ITEM("MPJoinAckRx", MPTCP_MIB_JOINACKRX),
 	SNMP_MIB_ITEM("MPJoinAckHMacFailure", MPTCP_MIB_JOINACKMAC),
 	SNMP_MIB_ITEM("DSSNotMatching", MPTCP_MIB_DSSNOMATCH),
+	SNMP_MIB_ITEM("DSSCorruptionFallback", MPTCP_MIB_DSSCORRUPTIONFALLBACK),
+	SNMP_MIB_ITEM("DSSCorruptionReset", MPTCP_MIB_DSSCORRUPTIONRESET),
 	SNMP_MIB_ITEM("InfiniteMapRx", MPTCP_MIB_INFINITEMAPRX),
 	SNMP_MIB_ITEM("OFOQueueTail", MPTCP_MIB_OFOQUEUETAIL),
 	SNMP_MIB_ITEM("OFOQueue", MPTCP_MIB_OFOQUEUE),
diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h
index a9f43ff00..0e17e1ceb 100755
--- a/net/mptcp/mib.h
+++ b/net/mptcp/mib.h
@@ -16,6 +16,8 @@ enum linux_mptcp_mib_field {
 	MPTCP_MIB_JOINACKRX,		/* Received an ACK + MP_JOIN */
 	MPTCP_MIB_JOINACKMAC,		/* HMAC was wrong on ACK + MP_JOIN */
 	MPTCP_MIB_DSSNOMATCH,		/* Received a new mapping that did not match the previous one */
+	MPTCP_MIB_DSSCORRUPTIONFALLBACK,/* DSS corruption detected, fallback */
+	MPTCP_MIB_DSSCORRUPTIONRESET,	/* DSS corruption detected, MPJ subflow reset */
 	MPTCP_MIB_INFINITEMAPRX,	/* Received an infinite mapping */
 	MPTCP_MIB_OFOQUEUETAIL,	/* Segments inserted into OoO queue tail */
 	MPTCP_MIB_OFOQUEUE,		/* Segments inserted into OoO queue */
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 24a21ff0c..8558309a2 100755
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -457,6 +457,18 @@ static void mptcp_check_data_fin(struct sock *sk)
 	}
 }
 
+static void mptcp_dss_corruption(struct mptcp_sock *msk, struct sock *ssk)
+{
+	if (READ_ONCE(msk->allow_infinite_fallback)) {
+		MPTCP_INC_STATS(sock_net(ssk),
+				MPTCP_MIB_DSSCORRUPTIONFALLBACK);
+		mptcp_do_fallback(ssk);
+	} else {
+		MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_DSSCORRUPTIONRESET);
+		mptcp_subflow_reset(ssk);
+	}
+}
+
 static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
 					   struct sock *ssk,
 					   unsigned int *bytes)
@@ -519,10 +531,12 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
 				moved += len;
 			seq += len;
 
-			if (WARN_ON_ONCE(map_remaining < len))
-				break;
+			if (unlikely(map_remaining < len))
+				mptcp_dss_corruption(msk, ssk);
 		} else {
-			WARN_ON_ONCE(!fin);
+			if (unlikely(!fin))
+				mptcp_dss_corruption(msk, ssk);
+
 			sk_eat_skb(ssk, skb);
 			done = true;
 		}
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 0c020ca46..c3434069f 100755
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -702,7 +702,7 @@ static bool skb_is_fully_mapped(struct sock *ssk, struct sk_buff *skb)
 	unsigned int skb_consumed;
 
 	skb_consumed = tcp_sk(ssk)->copied_seq - TCP_SKB_CB(skb)->seq;
-	if (WARN_ON_ONCE(skb_consumed >= skb->len))
+	if (unlikely(skb_consumed >= skb->len))
 		return true;
 
 	return skb->len - skb_consumed <= subflow->map_data_len -