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Date: Thu, 19 Oct 2023 22:47:58 +0000
From: Justin Stitt <>
To: "Rafael J. Wysocki" <>, Len Brown <>
Cc:,,, Justin Stitt <>
Subject: [PATCH] ACPI: 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

We know dev->name should be NUL-terminated based on the presence of a
manual NUL-byte assignment.

NUL-padding is not required as dev is already zero-allocated which
renders any further NUL-byte assignments redundant:
dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid); --->
  dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);

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. This simplifies the code and makes
the intent/behavior more obvious.

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

Found with: $ rg "strncpy\("
 drivers/pnp/pnpacpi/core.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index 6ab272c84b7b..a0927081a003 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -250,12 +250,9 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
 		dev->capabilities |= PNP_DISABLE;
 	if (strlen(acpi_device_name(device)))
-		strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
+		strscpy(dev->name, acpi_device_name(device), sizeof(dev->name));
-		strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
-	/* Handle possible string truncation */
-	dev->name[sizeof(dev->name) - 1] = '\0';
+		strscpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 	if (dev->active)

base-commit: dab3e01664eaddae965699f1fec776609db0ea9d
change-id: 20231019-strncpy-drivers-pnp-pnpacpi-core-c-54d9bc42443e

Best regards,
Justin Stitt <>

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