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Date: Thu, 19 Oct 2023 17:29:01 +0000
From: Justin Stitt <>
To: Kalle Valo <>
Cc:,,, Justin Stitt <>
Subject: [PATCH v2] atmel: 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 expect priv->firmware_id to be NUL-terminated based on its usage
with seq_printf() and strlen() in atmel.c:
1420 |       seq_printf(m, "%s loaded by host\n", priv->firmware_id);
3884 |       if (strlen(priv->firmware_id) == 0) {

NUL-padding is not required, which is evident by the usage of a plain
3891 |   strcpy(priv->firmware_id, "atmel_at76c502.bin");

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 also replace hard-coded lengths to be `sizeof(...)` for buffers
that the compiler can detect the size for as this is less error prone.

Link: [1]
Link: [2]
Link: [3]
Signed-off-by: Justin Stitt <>
Changes in v2:
- leave strcpy() usage as is (thanks Kees)
- Link to v1:
Note: build-tested only.

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

diff --git a/drivers/net/wireless/atmel/atmel.c b/drivers/net/wireless/atmel/atmel.c
index 7c2d1c588156..99920430e8b4 100644
--- a/drivers/net/wireless/atmel/atmel.c
+++ b/drivers/net/wireless/atmel/atmel.c
@@ -2651,8 +2651,7 @@ static int atmel_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 		priv->firmware = new_firmware;
 		priv->firmware_length = com.len;
-		strncpy(priv->firmware_id,, 31);
-		priv->firmware_id[31] = '\0';
+		strscpy(priv->firmware_id,, sizeof(priv->firmware_id));
 	case ATMELRD:

base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
change-id: 20231016-strncpy-drivers-net-wireless-atmel-atmel-c-7ca951cf7cfa

Best regards,
Justin Stitt <>

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