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    Subject[PATCH 4.14 044/138] nvme_fcloop: fix abort race condition
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: James Smart <jsmart2021@gmail.com>


    [ Upstream commit 278e096063f1914fccfc77a617be9fc8dbb31b0e ]

    A test case revealed a race condition of an i/o completing on a thread
    parallel to the delete_association generating the aborts for the
    outstanding ios on the controller. The i/o completion was freeing the
    target fcloop context, thus the abort task referenced the just-freed
    memory.

    Correct by clearing the target/initiator cross pointers in the io
    completion and abort tasks before calling the callbacks. On aborts
    that detect already finished io's, ensure the complete context is
    called.

    Signed-off-by: James Smart <james.smart@broadcom.com>
    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/nvme/target/fcloop.c | 12 +++++++-----
    1 file changed, 7 insertions(+), 5 deletions(-)

    --- a/drivers/nvme/target/fcloop.c
    +++ b/drivers/nvme/target/fcloop.c
    @@ -374,6 +374,7 @@ fcloop_tgt_fcprqst_done_work(struct work

    spin_lock(&tfcp_req->reqlock);
    fcpreq = tfcp_req->fcpreq;
    + tfcp_req->fcpreq = NULL;
    spin_unlock(&tfcp_req->reqlock);

    if (tport->remoteport && fcpreq) {
    @@ -615,11 +616,7 @@ fcloop_fcp_abort(struct nvme_fc_local_po

    if (!tfcp_req)
    /* abort has already been called */
    - return;
    -
    - if (rport->targetport)
    - nvmet_fc_rcv_fcp_abort(rport->targetport,
    - &tfcp_req->tgt_fcp_req);
    + goto finish;

    /* break initiator/target relationship for io */
    spin_lock(&tfcp_req->reqlock);
    @@ -627,6 +624,11 @@ fcloop_fcp_abort(struct nvme_fc_local_po
    tfcp_req->fcpreq = NULL;
    spin_unlock(&tfcp_req->reqlock);

    + if (rport->targetport)
    + nvmet_fc_rcv_fcp_abort(rport->targetport,
    + &tfcp_req->tgt_fcp_req);
    +
    +finish:
    /* post the aborted io completion */
    fcpreq->status = -ECANCELED;
    schedule_work(&inireq->iniwork);

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