linux-kernel - Re: [PATCH 0/6] usbip fixes to crashes found by syzbot

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Date:   Thu, 11 Mar 2021 13:57:39 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Shuah Khan <skhan@...uxfoundation.org>, shuah@...nel.org,
        valentina.manea.m@...il.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] usbip fixes to crashes found by syzbot

On Thu, Mar 11, 2021 at 09:34:38PM +0900, Tetsuo Handa wrote:
> On 2021/03/11 3:33, Greg KH wrote:
> > On Sun, Mar 07, 2021 at 08:53:25PM -0700, Shuah Khan wrote:
> >> This patch series fixes the following problems founds in syzbot
> >> fuzzing.
> > 
> > Thanks for these, all now queued up.
> 
> I send SIGSTOP to
> 
>   [PATCH 4/6] usbip: fix stub_dev usbip_sockfd_store() races leading to gpf
>   [PATCH 5/6] usbip: fix vhci_hcd attach_store() races leading to gpf
>   [PATCH 6/6] usbip: fix vudc usbip_sockfd_store races leading to gpf
> 
> because these patches merely converted NULL pointer dererefence bug to use-after-free bug
> by breaking kthread_get_run() into kthread_create()/get_task_struct()/wake_up_process().

I'll take follow-on patches to fix that other issue, if it's proven to
be valid.  It's nice to fix up NULL dereference issues as soon as
possible :)

thanks,

greg k-h