Re: [patch v2] virtio_console: silence a static checker warning

[walter harms <wharms@bfs.de>]

Am 08.05.2015 11:16, schrieb Dan Carpenter:
> My static checker complains that this sprintf() can overflow but really
> it can't.  Just silence the warning by using snprintf().
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> v2: the overflow is not possible so just leave the buffer size alone and
>     silence the warning with snprintf().
> 
> diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
> index 50754d20..8283989 100644
> --- a/drivers/char/virtio_console.c
> +++ b/drivers/char/virtio_console.c
> @@ -1492,8 +1492,8 @@ static int add_port(struct ports_device *portdev, u32 id)
>  		 * Finally, create the debugfs file that we can use to
>  		 * inspect a port's state at any time
>  		 */
> -		sprintf(debugfs_name, "vport%up%u",
> -			port->portdev->vdev->index, id);
> +		snprintf(debugfs_name, sizeof(debugfs_name), "vport%up%u",
> +			 port->portdev->vdev->index, id);


would it help to use %03u (or so) to make it more obvious ?

Note: i prefer a leading 0 in my programms to make it more easy
to work with grep and friends. you may thing otherwise.


re,
 wh

>  		port->debugfs_file = debugfs_create_file(debugfs_name, 0444,
>  							 pdrvdata.debugfs_dir,
>  							 port,
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