sctp: sctp_transport_lookup_process should rcu_read_unlock when transport is null
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@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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);
- if (!transport)
- goto out;
-
rcu_read_unlock();
+ if (!transport)
+ return -ENOENT;
+
err = cb(transport, p);
sctp_transport_put(transport);
-out:
return err;
}
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);