linux-kernel - Re: [PATCH net] net: dsa: ksz: fix padding size of skb

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Message-ID: <20201014164750.qelb6vssiubadslj@skbuf>
Date:   Wed, 14 Oct 2020 19:47:50 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Christian Eggers <ceggers@...i.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kurt Kanzenbach <kurt@...utronix.de>
Subject: Re: [PATCH net] net: dsa: ksz: fix padding size of skb

On Wed, Oct 14, 2020 at 06:17:19PM +0200, Christian Eggers wrote:
> __skb_put_padto() is called in order to ensure a minimal size of the
> sk_buff. The required minimal size is ETH_ZLEN + the size required for
> the tail tag.
>
> The current argument misses the size for the tail tag. The expression
> "skb->len + padlen" can be simplified to ETH_ZLEN.
>
> Too small sk_buffs typically result from cloning in
> dsa_skb_tx_timestamp(). The cloned sk_buff may not meet the minimum size
> requirements.
>
> Fixes: e71cb9e00922 ("net: dsa: ksz: fix skb freeing")
> Signed-off-by: Christian Eggers <ceggers@...i.de>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>