linux-kernel - Re: [PATCH] can: ucan: Correct the size parameter

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Message-ID: <20250218-daring-melodic-meerkat-3f5953-mkl@pengutronix.de>
Date: Tue, 18 Feb 2025 15:27:40 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc: Matt Jan <zoo868e@...il.com>, 
	syzbot+d7d8c418e8317899e88c@...kaller.appspotmail.com, linux-kernel@...r.kernel.org, linux-can@...r.kernel.org
Subject: Re: [PATCH] can: ucan: Correct the size parameter

On 18.02.2025 23:26:01, Vincent Mailhol wrote:
> >> @@ -1555,7 +1544,10 @@ static int ucan_probe(struct usb_interface *intf,
> >>
> >>         /* initialisation complete, log device info */
> >>         netdev_info(up->netdev, "registered device\n");
> >> -       netdev_info(up->netdev, "firmware string: %s\n", firmware_str);
> >> +       ucan_get_fw_info(up, up->ctl_msg_buffer->fw_info,
> >> +                        sizeof(up->ctl_msg_buffer->fw_info));
> >> +       netdev_info(up->netdev, "firmware string: %s\n",
> >> +                   up->ctl_msg_buffer->fw_info);
> > 
> > We could also use the:
> > 
> >     printf("%.*s", sizeof(up->ctl_msg_buffer->fw_info), up->ctl_msg_buffer->fw_info);
> > 
> > format string trick to only print a limited number of chars of the given
> > string.
> 
> Indeed. But after the renaming of ucan_device_request_in() into
> ucan_get_fw_info(), it makes slightly more sense to me to have this new
> function to handle the string NUL termination logic rather than to
> deffer it to the format string.

ACK, makes sense!

> But thanks for the suggestion.
> 
> > But I'm also fine with your solution. Either way, please send a
> > proper patch :)
> 
> Will do so right now!

Thanks,
Marc

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