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    Subject[PATCH 5.15 278/917] nvmet: fix use-after-free when a port is removed
    Date
    From: Israel Rukshin <israelr@nvidia.com>

    [ Upstream commit e3e19dcc4c416d65f99f13d55be2b787f8d0050e ]

    When a port is removed through configfs, any connected controllers
    are starting teardown flow asynchronously and can still send commands.
    This causes a use-after-free bug for any command that dereferences
    req->port (like in nvmet_parse_io_cmd).

    To fix this, wait for all the teardown scheduled works to complete
    (like release_work at rdma/tcp drivers). This ensures there are no
    active controllers when the port is eventually removed.

    Signed-off-by: Israel Rukshin <israelr@nvidia.com>
    Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/nvme/target/configfs.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
    index be5d82421e3a4..496d775c67707 100644
    --- a/drivers/nvme/target/configfs.c
    +++ b/drivers/nvme/target/configfs.c
    @@ -1553,6 +1553,8 @@ static void nvmet_port_release(struct config_item *item)
    {
    struct nvmet_port *port = to_nvmet_port(item);

    + /* Let inflight controllers teardown complete */
    + flush_scheduled_work();
    list_del(&port->global_entry);

    kfree(port->ana_state);
    --
    2.33.0


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