linux-kernel - Re: [PATCH] net: dwc-xlgmac: set skb to NULL after freeing it

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Date:   Wed, 28 Nov 2018 10:02:05 +0000
From:   Jose Abreu <jose.abreu@...opsys.com>
To:     Pan Bian <bianpan2016@....com>
CC:     "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: dwc-xlgmac: set skb to NULL after freeing it

On 28-11-2018 09:20, Pan Bian wrote:
> The buffer skb is freed via dev_kfree_skb in a loop. After freeing skb,
> the value of packet_count is updated via packet_count++. If packet_count
> happens to equal the upper bound (i.e., budget), the loop will be broken
> and skb may be assigned to desc_data->state.skb. Resulting that
> desc_data->state.skb may point to a freed memory chunk. To fix this, the
> patch sets skb to NULL after dev_kfree_skb(skb).
>
> Signed-off-by: Pan Bian <bianpan2016@....com>

This is missing the Fixes tag and your patch prefix should be
[PATCH net].

Thanks and Best Regards,
Jose Miguel Abreu