From: Bart Van Assche <bvanassche@acm.org>
To: yebin <yebin10@huawei.com>,
jejb@linux.ibm.com, martin.petersen@oracle.com,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATH v2] scsi: scsi_dh_rdac: Avoid crash during rdac_bus_attach
Date: Wed, 28 Jul 2021 14:55:19 -0700 [thread overview]
Message-ID: <1a86eadf-41fe-256e-2656-b9a13f73d88f@acm.org> (raw)
In-Reply-To: <61016887.9000200@huawei.com>
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@acm.org>
next prev parent reply other threads:[~2021-07-28 21:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-13 6:31 [PATH v2] scsi: scsi_dh_rdac: Avoid crash during rdac_bus_attach Ye Bin
2021-07-22 13:09 ` yebin
2021-07-23 4:04 ` Bart Van Assche
2021-07-28 14:24 ` yebin
2021-07-28 21:55 ` Bart Van Assche [this message]
2021-07-29 3:37 ` Martin K. Petersen
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