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nvmet: fix use-after-free when a port is removed

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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>
This commit is contained in:
Israel Rukshin 2021-10-06 08:09:43 +00:00 committed by Christoph Hellwig
parent 2b2af50ae8
commit e3e19dcc4c
1 changed files with 2 additions and 0 deletions
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2
drivers/nvme/target/configfs.c
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@ -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);