linux-kernel - Re: [PATCH] can: kvaser_usb: leaf: Fix infinite loop on zero-length cmd

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Message-ID: <20251023-athletic-courageous-pogona-1405d3-mkl@pengutronix.de>
Date: Thu, 23 Oct 2025 08:16:19 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: pip-izony <eeodqql09@...il.com>
Cc: Vincent Mailhol <mailhol@...nel.org>, 
	Kyungtae Kim <Kyungtae.Kim@...tmouth.edu>, Jimmy Assarsson <extja@...ser.com>, linux-can@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] can: kvaser_usb: leaf: Fix infinite loop on zero-length
 cmd

On 22.10.2025 20:39:09, pip-izony wrote:
> From: Seungjin Bae <eeodqql09@...il.com>
> 
> The `kvaser_usb_leaf_read_bulk_callback()` function parse received
> command buffers from the device. The firmware may insert zero-length
> placeholder commands to handle alignment with the USB endpoint's
> wMaxPacketSize.
> 
> The driver attempts to skip these placeholders by aligning the buffer
> position `pos` to the next packet boundary using `round_up()`
> function.

What about the round_up() in kvaser_usb_leaf_wait_cmd()? Is it also
affected by this problem?

Marc

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