net: sctp: sctp_endpoint_free: zero out secret key data

[ Upstream commit b5c37fe6e24eec194bb29d22fdd55d73bcc709bf ]

On sctp_endpoint_destroy, previously used sensitive keying material
should be zeroed out before the memory is returned, as we already do
with e.g. auth keys when released.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 1859e2bc83d113d1a14d01f904475b01099e0626..80a726428de2d91f9175a988451327a215f965c7 100644 (file)
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -249,6 +249,8 @@ void sctp_endpoint_free(struct sctp_endpoint *ep)
 /* Final destructor for endpoint.  */
 static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
 {
+       int i;
+
        SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
 
        /* Free up the HMAC transform. */
@@ -271,6 +273,9 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
        sctp_inq_free(&ep->base.inqueue);
        sctp_bind_addr_free(&ep->base.bind_addr);
 
+       for (i = 0; i < SCTP_HOW_MANY_SECRETS; ++i)
+               memset(&ep->secret_key[i], 0, SCTP_SECRET_SIZE);
+
        /* Remove and free the port */
        if (sctp_sk(ep->base.sk)->bind_hash)
                sctp_put_port(ep->base.sk);