[PATCH v2 2/2] nvmet: zns: return the namespace lookup error for Identify

[shao.mingyin]

From: Shao Mingyin <shao.mingyin@xxxxxxxxxx>

nvmet_execute_identify_ns_zns() jumps to done when nvmet_req_find_ns()
fails, and that label overwrites status with a successful copy of the
zeroed identify data.  An Identify with CNS 05h and CSI 02h for a
missing NSID therefore completes with SUCCESS and zeroed data instead
of Invalid Namespace.

Return the lookup error instead.

Fixes: aaf2e048af27 ("nvmet: add ZBD over ZNS backend support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Shao Mingyin <shao.mingyin@xxxxxxxxxx>

---
Tested on 7.3.0-next-20261030 (QEMU/TCG guest) with the loop transport
and CONFIG_BLK_DEV_ZONED.

An Identify with CNS 05h and CSI 02h for a namespace that does not
exist (NSID 100) completes successfully and returns a zeroed structure:

  unpatched                            patched
  ret=0, all 4096 bytes zero           ret=24587 (Invalid Namespace)

diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
index 92f5c1435582..cea05b4bc740 100644
--- a/drivers/nvme/target/zns.c
+++ b/drivers/nvme/target/zns.c
@@ -108,7 +108,7 @@ void nvmet_execute_identify_ns_zns(struct nvmet_req *req)
 
 	status = nvmet_req_find_ns(req);
 	if (status)
-		goto done;
+		goto out;
 
 	if (nvmet_ns_revalidate(req->ns)) {
 		mutex_lock(&req->ns->subsys->lock);
@@ -140,7 +140,6 @@ void nvmet_execute_identify_ns_zns(struct nvmet_req *req)
 		mar--;
 	id_zns->mar = cpu_to_le32(mar);
 
-done:
 	status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns));
 out:
 	kfree(id_zns);