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    Subject[PATCH 4.4 43/66] scsi: megaraid_sas: Check valid aen class range to avoid kernel panic
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

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

    From: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>

    commit 91b3d9f0069c8307d0b3a4c6843b65a439183318 upstream.

    Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
    Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
    Reviewed-by: Hannes Reinecke <hare@suse.com>
    Reviewed-by: Tomas Henzl <thenzl@redhat.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/scsi/megaraid/megaraid_sas_base.c | 8 ++++++++
    1 file changed, 8 insertions(+)

    --- a/drivers/scsi/megaraid/megaraid_sas_base.c
    +++ b/drivers/scsi/megaraid/megaraid_sas_base.c
    @@ -5094,6 +5094,14 @@ megasas_register_aen(struct megasas_inst
    prev_aen.word =
    le32_to_cpu(instance->aen_cmd->frame->dcmd.mbox.w[1]);

    + if ((curr_aen.members.class < MFI_EVT_CLASS_DEBUG) ||
    + (curr_aen.members.class > MFI_EVT_CLASS_DEAD)) {
    + dev_info(&instance->pdev->dev,
    + "%s %d out of range class %d send by application\n",
    + __func__, __LINE__, curr_aen.members.class);
    + return 0;
    + }
    +
    /*
    * A class whose enum value is smaller is inclusive of all
    * higher values. If a PROGRESS (= -1) was previously

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