nvmet: Identify-Active Namespace ID List command should reject invalid nsid

nsid values of 0xFFFFFFFE and 0XFFFFFFFF should be rejected with
a status code of "Invalid Namespace or Format".
See NVMe Base Specification, Active Namespace ID list (CNS 02h).

Fixes: a07b4970f464 ("nvmet: add a generic NVMe target")
Signed-off-by: Maurizio Lombardi <[e-mail]>
Reviewed-by: Sagi Grimberg <[e-mail]>
Signed-off-by: Keith Busch <[e-mail]>

drivers/nvme/target/admin-cmd.c

···
 	u16 status = 0;
 	int i = 0;
 
+	/*
+	 * NSID values 0xFFFFFFFE and NVME_NSID_ALL are invalid
+	 * See NVMe Base Specification, Active Namespace ID list (CNS 02h).
+	 */
+	if (min_nsid == 0xFFFFFFFE || min_nsid == NVME_NSID_ALL) {
+		req->error_loc = offsetof(struct nvme_identify, nsid);
+		status = NVME_SC_INVALID_NS | NVME_STATUS_DNR;
+		goto out;
+	}
+
 	list = kzalloc(buf_size, GFP_KERNEL);
 	if (!list) {
 		status = NVME_SC_INTERNAL;