On Thu, Dec 15, 2016 at 11:05:52PM +0800, Xin Long wrote:
> Prior to this patch, sctp_transport_lookup_process didn't rcu_read_unlock
> when it failed to find a transport by sctp_addrs_lookup_transport.
>
> This patch is to fix it by moving up rcu_read_unlock right before checking
> transport and also to remove the out path.
>
> Fixes: 1cceda784980 ("sctp: fix the issue sctp_diag uses lock_sock in rcu_read_lock")
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> ---
> net/sctp/socket.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index d5f4b4a..318c678 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -4472,18 +4472,17 @@ int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
> const union sctp_addr *paddr, void *p)
> {
> struct sctp_transport *transport;
> - int err = -ENOENT;
> + int err;
>
> rcu_read_lock();
> transport = sctp_addrs_lookup_transport(net, laddr, paddr);
> + rcu_read_unlock();
> if (!transport)
> - goto out;
> + return -ENOENT;
>
> - rcu_read_unlock();
> err = cb(transport, p);
> sctp_transport_put(transport);
>
> -out:
> return err;
> }
> EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
> --
> 2.1.0
>
> --
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