linux-kernel - Re: [PATCH] greybus: firmware: use strscpy, fix tag size

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Message-ID: <29717a11-8867-4a28-81a6-2d847b254042@suswa.mountain>
Date: Wed, 18 Jun 2025 23:42:15 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Pranav Tyagi <pranav.tyagi03@...il.com>
Cc: johan@...nel.org, elder@...nel.org, gregkh@...uxfoundation.org,
	vireshk@...nel.org, greybus-dev@...ts.linaro.org,
	linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
	skhan@...uxfoundation.org, linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] greybus: firmware: use strscpy, fix tag size

On Tue, Jun 17, 2025 at 06:21:37PM +0530, Pranav Tyagi wrote:
> Increase the size of firmware_tag arrays in the following structs from
> GB_FIRMWARE_U_TAG_MAX_SIZE to GB_FIRMWARE_U_TAG_MAX_SIZE + 1 to
> accommodate null termination:
> 	- fw_mgmt_ioc_intf_load_and_validate
> 	- fw_mgmt_ioc_get_backend_version
> 	- fw_mgmt_ioc_backend_fw_update
> 	- fw_mgmt_ioc_get_intf_version
> 
> Replace strncpy() with strscpy() to ensure proper null termination as
> firmware_tag is interpreted as a null-terminated string
> and printed with %s.
> 
> Signed-off-by: Pranav Tyagi <pranav.tyagi03@...il.com>
> ---
>  .../greybus/Documentation/firmware/firmware.c        | 12 ++++++------
>  drivers/staging/greybus/greybus_firmware.h           |  8 ++++----
>  2 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/staging/greybus/Documentation/firmware/firmware.c b/drivers/staging/greybus/Documentation/firmware/firmware.c
> index 765d69faa9cc..3b4061f4b34a 100644
> --- a/drivers/staging/greybus/Documentation/firmware/firmware.c
> +++ b/drivers/staging/greybus/Documentation/firmware/firmware.c
> @@ -63,8 +63,8 @@ static int update_intf_firmware(int fd)
>  	intf_load.major = 0;
>  	intf_load.minor = 0;
>  
> -	strncpy((char *)&intf_load.firmware_tag, firmware_tag,
> -		GB_FIRMWARE_U_TAG_MAX_SIZE);
> +	strscpy((char *)&intf_load.firmware_tag, firmware_tag,
> +		GB_FIRMWARE_U_TAG_MAX_SIZE + 1);


This is in the Documentation/ directory.  It's sample userspace
code.  Userspace code doesn't have strscpy() so this won't
compile.

regards,
dan carpenter