[PATCH v4 2/6] accel/ivpu: Use effective buffer size for zero terminator

[Jacek Lawrynowicz]

Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz at linux.intel.com>

On 5/8/2025 3:06 PM, Markus Burri wrote:
> Use the effective written size instead of original size as index for zero
> termination. If the input from user-space is to larger and the input is
> truncated, the original size is out-of-bound.
> Since there is an upfront size check here, the change is for consistency.
> 
> Signed-off-by: Markus Burri <markus.burri at mt.com>
> ---
>  drivers/accel/ivpu/ivpu_debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/accel/ivpu/ivpu_debugfs.c b/drivers/accel/ivpu/ivpu_debugfs.c
> index f0dad0c9ce33..cd24ccd20ba6 100644
> --- a/drivers/accel/ivpu/ivpu_debugfs.c
> +++ b/drivers/accel/ivpu/ivpu_debugfs.c
> @@ -455,7 +455,7 @@ priority_bands_fops_write(struct file *file, const char __user *user_buf, size_t
>  	if (ret < 0)
>  		return ret;
>  
> -	buf[size] = '\0';
> +	buf[ret] = '\0';
>  	ret = sscanf(buf, "%u %u %u %u", &band, &grace_period, &process_grace_period,
>  		     &process_quantum);
>  	if (ret != 4)