linux-kernel - Re: [syzbot] KASAN: use-after-free Read in addr

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Date:   Wed, 6 Oct 2021 08:41:59 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Hillf Danton <hdanton@...a.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+dc3dfba010d7671e05f5@...kaller.appspotmail.com>,
        dledford@...hat.com, leon@...nel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        Aleksandr Nogikh <nogikh@...gle.com>
Subject: Re: [syzbot] KASAN: use-after-free Read in addr_handler (4)

On Wed, Oct 06, 2021 at 11:18:00AM +0800, Hillf Danton wrote:
> +++ b/drivers/infiniband/core/addr.c
> @@ -795,6 +795,11 @@ void rdma_addr_cancel(struct rdma_dev_ad
>  	 * guarentees no work is running and none will be started.
>  	 */
>  	cancel_delayed_work_sync(&found->work);
> +	/*
> +	 * flush is needed if work is queued again while it is running, as
> +	 * cancel waits nothing.
> +	 */
> +	flush_work(&found->work);

The _sync() above does the same, cancel doesn't return while the work
is running

Jason