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Date: Mon, 23 Oct 2023 19:50:57 +0000
From: Justin Stitt <>
To: Adam Radford <>, "James E.J. Bottomley" <>, 
	"Martin K. Petersen" <>
Cc:,,, Justin Stitt <>
Subject: [PATCH] scsi: 3w-sas: 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

This pattern of strncpy(dest, src, strlen(src)) is extremely bug-prone.
This pattern basically never results in NUL-terminated destination
strings unless `dest` was zero-initialized. The current implementation
may be accidentally correct as tw_dev is zero-allocated via:

	host = scsi_host_alloc(&driver_template, sizeof(TW_Device_Extension));
	tw_dev = shost_priv(host);

... wherein scsi_host_alloc zero-allocates host:

        shost = kzalloc(sizeof(struct Scsi_Host) + privsize, GFP_KERNEL);

Also, further suggesting this change is worthwhile is another strscpy()
usage in 32-9xxx.c:

	strscpy(tw_dev->tw_compat_info.driver_version, TW_DRIVER_VERSION,

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.

Let's not be accidentally correct, let's be definitely correct.

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

Found with: $ rg "strncpy\("
 drivers/scsi/3w-sas.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
index 55989eaa2d9f..9bdb75dfdcd7 100644
--- a/drivers/scsi/3w-sas.c
+++ b/drivers/scsi/3w-sas.c
@@ -1326,7 +1326,8 @@ static int twl_reset_sequence(TW_Device_Extension *tw_dev, int soft_reset)
 		/* Load rest of compatibility struct */
-		strncpy(tw_dev->tw_compat_info.driver_version, TW_DRIVER_VERSION, strlen(TW_DRIVER_VERSION));
+		strscpy(tw_dev->tw_compat_info.driver_version, TW_DRIVER_VERSION,
+			sizeof(tw_dev->tw_compat_info.driver_version));
 		tw_dev->tw_compat_info.driver_srl_high = TW_CURRENT_DRIVER_SRL;
 		tw_dev->tw_compat_info.driver_branch_high = TW_CURRENT_DRIVER_BRANCH;
 		tw_dev->tw_compat_info.driver_build_high = TW_CURRENT_DRIVER_BUILD;

base-commit: 9c5d00cb7b6bbc5a7965d9ab7d223b5402d1f02c
change-id: 20231023-strncpy-drivers-scsi-3w-sas-c-c7cc037d4bc9

Best regards,
Justin Stitt <>

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