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From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
To: Felipe Balbi <balbi@kernel.org>,
	Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Cc: John Youn <John.Youn@synopsys.com>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: [PATCH] usb: dwc3: gadget: Check for NULL descriptor
Date: Wed, 4 Dec 2019 01:48:51 +0000	[thread overview]
Message-ID: <b2277d8d-8b7f-15cd-fa18-e8c3d08ead4a@synopsys.com> (raw)
In-Reply-To: <87sgm18q1x.fsf@gmail.com>

Hi Felipe,

Felipe Balbi wrote:
> Hi,
>
> Thinh Nguyen <Thinh.Nguyen@synopsys.com> writes:
>
>> The function driver may try to enable an unconfigured endpoint. This
>> check make sure that we do not attempt to access a NULL descriptor and
>> crash.
>>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
>> ---
>>   drivers/usb/dwc3/gadget.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>> index 7f97856e6b20..00f8f079bbf2 100644
>> --- a/drivers/usb/dwc3/gadget.c
>> +++ b/drivers/usb/dwc3/gadget.c
>> @@ -619,6 +619,9 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
>>   	u32			reg;
>>   	int			ret;
>>   
>> +	if (!desc)
>> +		return -EINVAL;
> I would rather have a dev_WARN() (and return -EINVAL) added to
> usb_ep_enable() so we catch those doing this. That way we don't have to
> patch every UDC.
>

Sure, we can do that.

Thanks,
Thinh

      reply	other threads:[~2019-12-04  1:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 21:45 [PATCH] usb: dwc3: gadget: Check for NULL descriptor Thinh Nguyen
2019-11-28  7:18 ` Greg Kroah-Hartman
2019-11-28 20:40   ` Thinh Nguyen
2019-12-03 14:03 ` Felipe Balbi
2019-12-04  1:48   ` Thinh Nguyen [this message]

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