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Date: Thu, 19 Oct 2023 21:34:35 +0000
From: Justin Stitt <>
To: James Smart <>, Keith Busch <>, 
	Jens Axboe <>, Christoph Hellwig <>, Sagi Grimberg <>
Cc:,,, Justin Stitt <>
Subject: [PATCH] nvme-fc: replace deprecated strncpy with strscpy

strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string

Let's instead use strscpy() [2] as it guarantees NUL-termination on the
destination buffer.

Moreover, there is no need to use:


I imagine this was originally done to make sure the destination buffer
is NUL-terminated by ensuring we copy a number of bytes less than the
size of our destination, thus leaving some NUL-bytes at the end.

However, with strscpy(), we no longer need to do this and we can instead
opt for the more idiomatic strscpy() usage of:

| strscpy(dest, src, sizeof(dest))

Also, no NUL-padding is required as lsop is zero-allocated:

|       lsop = kzalloc((sizeof(*lsop) +
|                        sizeof(*assoc_rqst) + sizeof(*assoc_acc) +
|                        ctrl->lport->ops->lsrqst_priv_sz), GFP_KERNEL);

... and assoc_rqst points to a field in lsop:

|       assoc_rqst = (struct fcnvme_ls_cr_assoc_rqst *)&lsop[1];

Therefore, any additional NUL-byte assignments (like the ones that
strncpy() makes) are redundant.

Link: [1]
Link: [2]
Signed-off-by: Justin Stitt <>
Note: build-tested only.
 drivers/nvme/host/fc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index a15b37750d6e..680585253f7c 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -1218,10 +1218,10 @@ nvme_fc_connect_admin_queue(struct nvme_fc_ctrl *ctrl,
 	/* Linux supports only Dynamic controllers */
 	assoc_rqst->assoc_cmd.cntlid = cpu_to_be16(0xffff);
 	uuid_copy(&assoc_rqst->assoc_cmd.hostid, &ctrl->ctrl.opts->host->id);
-	strncpy(assoc_rqst->assoc_cmd.hostnqn, ctrl->ctrl.opts->host->nqn,
-	strncpy(assoc_rqst->assoc_cmd.subnqn, ctrl->ctrl.opts->subsysnqn,
+	strscpy(assoc_rqst->assoc_cmd.hostnqn, ctrl->ctrl.opts->host->nqn,
+		sizeof(assoc_rqst->assoc_cmd.hostnqn));
+	strscpy(assoc_rqst->assoc_cmd.subnqn, ctrl->ctrl.opts->subsysnqn,
+		sizeof(assoc_rqst->assoc_cmd.subnqn));
 	lsop->queue = queue;
 	lsreq->rqstaddr = assoc_rqst;

base-commit: dab3e01664eaddae965699f1fec776609db0ea9d
change-id: 20231019-strncpy-drivers-nvme-host-fc-c-a542b34b8710

Best regards,
Justin Stitt <>

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