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Date: Thu, 12 Oct 2023 20:38:19 +0000
From: Justin Stitt <>
To: Edward Cree <>, Martin Habets <>, 
	"David S. Miller" <>, Eric Dumazet <>, 
	Jakub Kicinski <>, Paolo Abeni <>
	Justin Stitt <>
Subject: [PATCH] sfc: 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

`desc` is expected to be NUL-terminated as evident by the manual
NUL-byte assignment. Moreover, NUL-padding does not seem to be

The only caller of efx_mcdi_nvram_metadata() is
efx_devlink_info_nvram_partition() which provides a NULL for `desc`:
|       rc = efx_mcdi_nvram_metadata(efx, partition_type, NULL, version, NULL, 0);

Due to this, I am not sure this code is even reached but we should still
favor something other than strncpy.

Considering the above, a suitable replacement is `strscpy` [2] due to
the fact that it guarantees NUL-termination on the destination buffer
without unnecessarily NUL-padding.

Link: [1]
Link: [2]
Signed-off-by: Justin Stitt <>
Note: build-tested only.

Found with: $ rg "strncpy\("
 drivers/net/ethernet/sfc/mcdi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c
index d23da9627338..76578502226e 100644
--- a/drivers/net/ethernet/sfc/mcdi.c
+++ b/drivers/net/ethernet/sfc/mcdi.c
@@ -2205,10 +2205,9 @@ int efx_mcdi_nvram_metadata(struct efx_nic *efx, unsigned int type,
 				goto out_free;
-			strncpy(desc,
+			strscpy(desc,
 		} else {
 			desc[0] = '\0';

base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231012-strncpy-drivers-net-ethernet-sfc-mcdi-c-cf970a9b7d60

Best regards,
Justin Stitt <>

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