linux-kernel - Re: [PATCH v5 3/5] can: do not copy the payload of RTR frames

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Message-ID: <20211210073545.qdldwmaykts5dr4u@pengutronix.de>
Date:   Fri, 10 Dec 2021 08:35:45 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc:     linux-can@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Jimmy Assarsson <extja@...ser.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, Yasushi SHOJI <yashi@...cecubics.com>
Subject: Re: [PATCH v5 3/5] can: do not copy the payload of RTR frames

On 07.12.2021 21:15:29, Vincent Mailhol wrote:
> The actual payload length of the CAN Remote Transmission Request (RTR)
> frames is always 0, i.e. nothing is transmitted on the wire. However,
                           ^^^^^^^
I've changed this to "no payload" to make it more unambiguous.

> those RTR frames still use the DLC to indicate the length of the
> requested frame.
> 
> For this reason, it is incorrect to copy the payload of RTR frames
> (the payload buffer would only contain garbage data). This patch
> encapsulates the payload copy in a check toward the RTR flag.
> 
> CC: Yasushi SHOJI <yashi@...cecubics.com>
> Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>

Marc

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