From 9cca73d7b4bfec75b2fcef751015f31691afa792 Mon Sep 17 00:00:00 2001 From: Justin Stitt Date: Tue, 26 Sep 2023 06:59:15 +0000 Subject: [PATCH] hwmon: (acpi_power_meter) replace open-coded kmemdup_nul `strncpy` is deprecated for use on NUL-terminated destination strings [1]. Let's refactor this kcalloc() + strncpy() into a kmemdup_nul() which has more obvious behavior and is less error prone. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20230926-strncpy-drivers-hwmon-acpi_power_meter-c-v5-1-3fc31a9daf99@google.com Signed-off-by: Kees Cook --- drivers/hwmon/acpi_power_meter.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c index fa28d447f0dfb..8db740214ffda 100644 --- a/drivers/hwmon/acpi_power_meter.c +++ b/drivers/hwmon/acpi_power_meter.c @@ -796,14 +796,13 @@ static int read_capabilities(struct acpi_power_meter_resource *resource) goto error; } - *str = kcalloc(element->string.length + 1, sizeof(u8), - GFP_KERNEL); + *str = kmemdup_nul(element->string.pointer, element->string.length, + GFP_KERNEL); if (!*str) { res = -ENOMEM; goto error; } - strncpy(*str, element->string.pointer, element->string.length); str++; } -- 2.30.2