netdev - [PATCH net-next 5/5] sctp: check for ipv6_pinfo legal sndflow with flowlabel in sctp_v6_get

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Message-Id: <f585de26340b8fac56f5551501d40488db90928a.1529892764.git.lucien.xin@gmail.com>
Date:   Mon, 25 Jun 2018 10:14:37 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>, davem@...emloft.net
Subject: [PATCH net-next 5/5] sctp: check for ipv6_pinfo legal sndflow with flowlabel in sctp_v6_get_dst

The transport with illegal flowlabel should not be allowed to send
packets. Other transport protocols already denies this.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/sctp/ipv6.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 772513d..d83ddc4 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -262,6 +262,15 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 	if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
 		fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
 
+	if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
+		struct ip6_flowlabel *flowlabel;
+
+		flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
+		if (!flowlabel)
+			goto out;
+		fl6_sock_release(flowlabel);
+	}
+
 	pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
 
 	if (asoc)
-- 
2.1.0