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scsi: iscsi: Fix endpoint reuse regression
This patch fixes a bug where when using iSCSI offload we can free an endpoint while userspace still thinks it's active. That then causes the endpoint ID to be reused for a new connection's endpoint while userspace still thinks the ID is for the original connection. Userspace will then end up disconnecting a running connection's endpoint or trying to bind to another connection's endpoint. This bug is a regression added in: Commit23d6fefbb3
("scsi: iscsi: Fix in-kernel conn failure handling") where we added a in kernel ep_disconnect call to fix a bug in: Commit0ab710458d
("scsi: iscsi: Perform connection failure entirely in kernel space") where we would call stop_conn without having done ep_disconnect. This early ep_disconnect call will then free the endpoint and it's ID while userspace still thinks the ID is valid. Fix the early release of the ID by having the in kernel recovery code keep a reference to the endpoint until userspace has called into the kernel to finish cleaning up the endpoint/connection. It requires the previous commit "scsi: iscsi: Release endpoint ID when its freed" which moved the freeing of the ID until when the endpoint is released. Link: https://lore.kernel.org/r/20220408001314.5014-5-michael.christie@oracle.com Fixes:23d6fefbb3
("scsi: iscsi: Fix in-kernel conn failure handling") Tested-by: Manish Rangankar <mrangankar@marvell.com> Reviewed-by: Lee Duncan <lduncan@suse.com> Reviewed-by: Chris Leech <cleech@redhat.com> Signed-off-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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0aadafb5c3
1 changed files with 11 additions and 1 deletions
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@ -2247,7 +2247,11 @@ static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
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mutex_unlock(&conn->ep_mutex);
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flush_work(&conn->cleanup_work);
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/*
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* Userspace is now done with the EP so we can release the ref
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* iscsi_cleanup_conn_work_fn took.
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*/
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iscsi_put_endpoint(ep);
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mutex_lock(&conn->ep_mutex);
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}
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}
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@ -2322,6 +2326,12 @@ static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
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return;
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}
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/*
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* Get a ref to the ep, so we don't release its ID until after
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* userspace is done referencing it in iscsi_if_disconnect_bound_ep.
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*/
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if (conn->ep)
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get_device(&conn->ep->dev);
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iscsi_ep_disconnect(conn, false);
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if (system_state != SYSTEM_RUNNING) {
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