On Sun, Mar 03, 2019 at 05:54:53PM +0800, Xin Long wrote:
> It should fail to create the new sk if sctp_bind_addr_dup() fails
> when accepting or peeloff an association.
>
> Signed-off-by: Xin Long <lucien....@gmail.com>
> ---
> net/sctp/socket.c | 34 ++++++++++++++++++++++++----------
> 1 file changed, 24 insertions(+), 10 deletions(-)
>
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index a2771b3..22adb8d 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -102,9 +102,9 @@ static int sctp_send_asconf(struct sctp_association *asoc,
> struct sctp_chunk *chunk);
> static int sctp_do_bind(struct sock *, union sctp_addr *, int);
> static int sctp_autobind(struct sock *sk);
> -static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
> - struct sctp_association *assoc,
> - enum sctp_socket_type type);
> +static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
> + struct sctp_association *assoc,
> + enum sctp_socket_type type);
>
> static unsigned long sctp_memory_pressure;
> static atomic_long_t sctp_memory_allocated;
> @@ -4655,7 +4655,11 @@ static struct sock *sctp_accept(struct sock *sk, int
> flags, int *err, bool kern)
> /* Populate the fields of the newsk from the oldsk and migrate the
> * asoc to the newsk.
> */
> - sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
> + error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
> + if (error) {
> + sk_common_release(newsk);
> + newsk = NULL;
> + }
>
> out:
> release_sock(sk);
> @@ -5401,7 +5405,12 @@ int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id,
> struct socket **sockp)
> /* Populate the fields of the newsk from the oldsk and migrate the
> * asoc to the newsk.
> */
> - sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
> + err = sctp_sock_migrate(sk, sock->sk, asoc,
> + SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
> + if (err) {
> + sock_release(sock);
I'm having a hard time understanding why it needs sock_release() here
and sk_common_release() in the above chunk. AFAICT by here (after
sctp_sock_migrate call) the sockets are pretty much the same. Mind
elaborating please?
> + sock = NULL;
> + }
>
> *sockp = sock;
>
