linux-kernel - Re: [PATCH v2 3/3] net: ethernet: mtk_eth_soc: fix possible NULL pointer dereference in mtk_hwlro_get_fdir

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Message-ID: <20230910144728.GF775887@kernel.org>
Date:   Sun, 10 Sep 2023 16:47:28 +0200
From:   Simon Horman <horms@...nel.org>
To:     Hangyu Hua <hbh25y@...il.com>
Cc:     justin.chen@...adcom.com, florian.fainelli@...adcom.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mw@...ihalf.com, linux@...linux.org.uk,
        nbd@....name, john@...ozen.org, sean.wang@...iatek.com,
        Mark-MC.Lee@...iatek.com, lorenzo@...nel.org,
        matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
        maxime.chevallier@...tlin.com, nelson.chang@...iatek.com,
        bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 3/3] net: ethernet: mtk_eth_soc: fix possible NULL
 pointer dereference in mtk_hwlro_get_fdir_all()

On Fri, Sep 08, 2023 at 02:19:50PM +0800, Hangyu Hua wrote:
> rule_locs is allocated in ethtool_get_rxnfc and the size is determined by
> rule_cnt from user space. So rule_cnt needs to be check before using
> rule_locs to avoid NULL pointer dereference.
> 
> Fixes: 7aab747e5563 ("net: ethernet: mediatek: add ethtool functions to configure RX flows of HW LRO")
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>

Reviewed-by: Simon Horman <horms@...nel.org>