linux-kernel - Re: [PATCH v3] usb: gadget: udc: renesas_usb3: Fix use after free bug in renesas_usb3

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Date:   Thu, 16 Mar 2023 11:55:11 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zheng Wang <zyytlz.wz@....com>
Cc:     p.zabel@...gutronix.de, biju.das.jz@...renesas.com,
        phil.edworthy@...esas.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, hackerzheng666@...il.com,
        1395428693sheep@...il.com, alex000young@...il.com,
        yoshihiro.shimoda.uh@...esas.com
Subject: Re: [PATCH v3] usb: gadget: udc: renesas_usb3: Fix use after free
 bug in  renesas_usb3_remove due to race condition

On Tue, Mar 14, 2023 at 12:51:28AM +0800, Zheng Wang wrote:
> In renesas_usb3_probe, &usb3->role_work is bound with
> renesas_usb3_role_work. renesas_usb3_start will be called
> to start the work.
> 
> If we remove the driver which will call usbhs_remove, there may be
> an unfinished work. The possible sequence is as follows:
> 
> Fix it by canceling the work before cleanup in the renesas_usb3_remove
> 
> CPU0                  CPU1
> 
>                     |renesas_usb3_role_work
> renesas_usb3_remove |
> usb_role_switch_unregister  |
> device_unregister   |
> kfree(sw)  	     |
> free usb3->role_sw  |
>                     |   usb_role_switch_set_role
>                     |   //use usb3->role_sw
> 
> Fixes: 39facfa01c9f ("usb: gadget: udc: renesas_usb3: Add register of usb role switch")
> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Signed-off-by: Zheng Wang <zyytlz.wz@....com>
> ---
> v3:
> - modify the commit message to make it clearer suggested by Yoshihiro Shimoda

I see 2 v3 patches in the mailing list, which is obviously not correct.

Please resubmit a v4 properly.

thanks,

greg k-h