This is a note to let you know that I've just added the patch titled

dccp: CVE-2017-8824: use-after-free in DCCP code

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: dccp-cve-2017-8824-use-after-free-in-dccp-code.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 69c64866ce072dea1d1e59a0d61e0f66c0dffb76 Mon Sep 17 00:00:00 2001

From: Mohamed Ghannam simo.ghannam@gmail.com Date: Tue, 5 Dec 2017 20:58:35 +0000 Subject: dccp: CVE-2017-8824: use-after-free in DCCP code

From: Mohamed Ghannam simo.ghannam@gmail.com

commit 69c64866ce072dea1d1e59a0d61e0f66c0dffb76 upstream.

Whenever the sock object is in DCCP_CLOSED state, dccp_disconnect() must free dccps_hc_tx_ccid and dccps_hc_rx_ccid and set to NULL.

Signed-off-by: Mohamed Ghannam simo.ghannam@gmail.com Reviewed-by: Eric Dumazet edumazet@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- net/dccp/proto.c | 5 +++++ 1 file changed, 5 insertions(+)

--- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -259,6 +259,7 @@ int dccp_disconnect(struct sock *sk, int { struct inet_connection_sock *icsk = inet_csk(sk); struct inet_sock *inet = inet_sk(sk); + struct dccp_sock *dp = dccp_sk(sk); int err = 0; const int old_state = sk->sk_state;

@@ -278,6 +279,10 @@ int dccp_disconnect(struct sock *sk, int sk->sk_err = ECONNRESET;

dccp_clear_xmit_timers(sk); + ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); + ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); + dp->dccps_hc_rx_ccid = NULL; + dp->dccps_hc_tx_ccid = NULL;

__skb_queue_purge(&sk->sk_receive_queue); __skb_queue_purge(&sk->sk_write_queue);

Patches currently in stable-queue which might be from simo.ghannam@gmail.com are

queue-4.14/dccp-cve-2017-8824-use-after-free-in-dccp-code.patch