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    Subject[PATCH 4.19 271/293] ibmvnic: check failover_pending in login response
    Date
    From: Sukadev Bhattiprolu <sukadev@linux.ibm.com>

    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: 032c5e82847a ("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>
    ---
    drivers/net/ethernet/ibm/ibmvnic.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    --- a/drivers/net/ethernet/ibm/ibmvnic.c
    +++ b/drivers/net/ethernet/ibm/ibmvnic.c
    @@ -4038,6 +4038,14 @@ static int handle_login_rsp(union ibmvni
    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");

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