linux-kernel - Re: [PATCH v2] usb: dwc3: avoid NULL access of usb_gadget

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Message-ID: <20210629143251.GA699290@rowland.harvard.edu>
Date:   Tue, 29 Jun 2021 10:32:51 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Linyu Yuan <linyyuan@...eaurora.org>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jack Pham <jackp@...eaurora.org>
Subject: Re: [PATCH v2] usb: dwc3: avoid NULL access of usb_gadget_driver

On Tue, Jun 29, 2021 at 09:51:18AM +0800, Linyu Yuan wrote:
> we found crash in dwc3_disconnect_gadget(),
> it is because dwc->gadget_driver become NULL before async access.
> 7dc0c55e9f30 ('USB: UDC core: Add udc_async_callbacks gadget op')
> suggest a common way to avoid such kind of issue.
> 
> this change implment the callback in dwc3 and
> change related functions which have callback to usb gadget driver.
> 
> Signed-off-by: Linyu Yuan <linyyuan@...eaurora.org>
> ---
> 
> v2: add missing check in dwc3_reset_gadget(), found by Alan Stern.

This is better.

Acked-by: Alan Stern <stern@...land.harvard.edu>