From 0999f021c988770a37edfb266027db9c413901fd Mon Sep 17 00:00:00 2001 From: Xin Long Date: Mon, 2 Jul 2018 18:21:15 +0800 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/sctp/ipv6.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 38102bf7f13e..fc6c5e4bffa5 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)