ibmvnic: check failover_pending in login response

commit 273c29e944bda9a20a30c26cfc34c9a3f363280b upstream.

If a failover occurs before a login response is received, the login
response buffer maybe undefined. Check that there was no failover
before accessing the login response buffer.

Fixes: 70ece86a541c ("Driver for IBM System i/p VNIC protocol")
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index ecfe588f330ef9872daefe43fddfc423e1b594f6..cfe7229593ead549876249c27566dc1bc7b048ae 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -4277,6 +4277,14 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
                return 0;
        }
 
+       if (adapter->failover_pending) {
+               adapter->init_done_rc = -EAGAIN;
+               netdev_dbg(netdev, "Failover pending, ignoring login response\n");
+               complete(&adapter->init_done);
+               /* login response buffer will be released on reset */
+               return 0;
+       }
+
        netdev->mtu = adapter->req_mtu - ETH_HLEN;
 
        netdev_dbg(adapter->netdev, "Login Response Buffer:\n");