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authorDaniel Borkmann <dborkman@redhat.com>2013-08-09 16:25:21 +0200
committerDavid S. Miller <davem@davemloft.net>2013-08-12 22:13:47 -0700
commit771085d6bf3c52de29fc213e5bad07a82e57c23e (patch)
treed303a22b45461e2d728dd1e59dfce9bb38cf3e8f /net/sctp
parentac4f9599362475662efb6efbb334cbcec98d4778 (diff)
downloadlinux-771085d6bf3c52de29fc213e5bad07a82e57c23e.tar.gz
net: sctp: sctp_transport_destroy{, _rcu}: fix potential pointer corruption
Probably this one is quite unlikely to be triggered, but it's more safe to do the call_rcu() at the end after we have dropped the reference on the asoc and freed sctp packet chunks. The reason why is because in sctp_transport_destroy_rcu() the transport is being kfree()'d, and if we're unlucky enough we could run into corrupted pointers. Probably that's more of theoretical nature, but it's safer to have this simple fix. Introduced by commit 8c98653f ("sctp: sctp_close: fix release of bindings for deferred call_rcu's"). I also did the 8c98653f regression test and it's fine that way. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/transport.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index bdbbc3fd7c1..8fdd16046d6 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -181,12 +181,12 @@ static void sctp_transport_destroy(struct sctp_transport *transport)
return;
}
- call_rcu(&transport->rcu, sctp_transport_destroy_rcu);
-
sctp_packet_free(&transport->packet);
if (transport->asoc)
sctp_association_put(transport->asoc);
+
+ call_rcu(&transport->rcu, sctp_transport_destroy_rcu);
}
/* Start T3_rtx timer if it is not already running and update the heartbeat