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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <71f99f51-6bdc-0a25-d81c-12dc13f61271@synopsys.com>
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