linux-kernel - Re: [PATH v2] scsi: scsi_dh_rdac: Avoid crash during rdac_bus

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Message-ID: <1a86eadf-41fe-256e-2656-b9a13f73d88f@acm.org>
Date:   Wed, 28 Jul 2021 14:55:19 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     yebin <yebin10@...wei.com>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATH v2] scsi: scsi_dh_rdac: Avoid crash during rdac_bus_attach

On 7/28/21 7:24 AM, yebin wrote:
> On 2021/7/23 12:04, Bart Van Assche wrote:
>> On 1/12/21 10:31 PM, Ye Bin wrote:
>>>       sdev->handler_data = NULL;
>>> +    synchronize_rcu();
>>>       kfree(h);
>> What is the purpose of the new synchronize_rcu() call?
> Thanks for your reply.
> Yes, I add new synchronize_rcu() call is to wait until *h is no longer 
> in use. If free
> "h" right now , mybe lead to UAF.
>> If its purpose is
>> to wait until *h is no longer in use, please use kfree_rcu() instead.
> struct rdac_dh_data {
>          struct list_head        node;
>          .....
> }
> As rdac_dh_data.node type is "struct list_head", but  kfree_rcu the 
> first parameter type is
> "struct rcu_head". So we can only use synchronize_rcu() at here.

Ah, that's right. Hence:

Reviewed-by: Bart Van Assche <bvanassche@....org>