linux-kernel - Re: [PATCH v2] ethernet:enic: Fix a use after free bug in enic_hard_start

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Message-ID: <a7063675191930af6b5be0566244534de558869a.camel@cisco.com>
Date:   Mon, 3 May 2021 07:21:42 +0000
From:   "Govindarajulu Varadarajan (gvaradar)" <gvaradar@...co.com>
To:     "Christian Benvenuti (benve)" <benve@...co.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "lyl2019@...l.ustc.edu.cn" <lyl2019@...l.ustc.edu.cn>,
        "Govindarajulu Varadarajan (gvaradar)" <gvaradar@...co.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ethernet:enic: Fix a use after free bug in
 enic_hard_start_xmit

On Sun, 2021-05-02 at 04:58 -0700, Lv Yunlong wrote:
> In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside
> enic_queue_wq_skb, if some error happens, the skb will be freed
> by dev_kfree_skb(skb). But the freed skb is still used in
> skb_tx_timestamp(skb).
> 
> My patch makes enic_queue_wq_skb() return error and goto spin_unlock()
> incase of error. The solution is provided by Govind.
> See https://lkml.org/lkml/2021/4/30/961.
> 
> Fixes: fb7516d42478e ("enic: add sw timestamp support")
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>

Thanks,

Acked-by: Govindarajulu Varadarajan <gvaradar@...co.com>