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| author | Mohamed Ghannam <simo.ghannam@gmail.com> | 2017-12-05 21:58:35 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-12-06 00:08:53 +0100 |
| commit | 69c64866ce072dea1d1e59a0d61e0f66c0dffb76 (patch) | |
| tree | d4587f7c9475921120c56fa9e11d5ec0ea3d074d /net/dccp | |
| parent | net: remove hlist_nulls_add_tail_rcu() (diff) | |
| download | linux-69c64866ce072dea1d1e59a0d61e0f66c0dffb76.tar.xz linux-69c64866ce072dea1d1e59a0d61e0f66c0dffb76.zip | |
dccp: CVE-2017-8824: use-after-free in DCCP code
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>
Diffstat (limited to 'net/dccp')
| -rw-r--r-- | net/dccp/proto.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/dccp/proto.c b/net/dccp/proto.c index b68168fcc06a..9d43c1f40274 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -259,6 +259,7 @@ int dccp_disconnect(struct sock *sk, int flags) { 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 flags) 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); |