scsi: target/core: Fix a race condition in the LUN lookup code
The rcu_dereference(deve->se_lun) expression occurs twice in the LUN lookup
functions. Since these expressions are not serialized against deve->se_lun
assignments each of these expressions may yield a different result. Avoid
that the wrong LUN pointer is stored in se_cmd by reading deve->se_lun only
once.
Cc: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Fixes: 29a05deebf
("target: Convert se_node_acl->device_list[] to RCU hlist") # v4.10
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -85,7 +85,7 @@ transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
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goto out_unlock;
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}
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se_cmd->se_lun = rcu_dereference(deve->se_lun);
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se_cmd->se_lun = se_lun;
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se_cmd->pr_res_key = deve->pr_res_key;
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se_cmd->orig_fe_lun = unpacked_lun;
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se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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@ -176,7 +176,7 @@ int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
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goto out_unlock;
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}
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se_cmd->se_lun = rcu_dereference(deve->se_lun);
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se_cmd->se_lun = se_lun;
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se_cmd->pr_res_key = deve->pr_res_key;
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se_cmd->orig_fe_lun = unpacked_lun;
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se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
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