linux-kernel - Re: [PATCH v3] usb: dwc3: core: Prevent USB core invalid event buffer address access

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Message-ID: <4f286780-89a2-496d-9007-d35559f26a21@samsung.com>
Date: Fri, 16 Aug 2024 21:13:09 +0530
From: Selvarasu Ganesan <selvarasu.g@...sung.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: Thinh.Nguyen@...opsys.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, jh0801.jung@...sung.com,
	dh10.jung@...sung.com, naushad@...sung.com, akash.m5@...sung.com,
	rc93.raju@...sung.com, taehyun.cho@...sung.com, hongpooh.kim@...sung.com,
	eomji.oh@...sung.com, shijie.cai@...sung.com, stable@...r.kernel.org
Subject: Re: [PATCH v3] usb: dwc3: core: Prevent USB core invalid event
 buffer address access


On 8/16/2024 3:25 PM, Greg KH wrote:
> On Thu, Aug 15, 2024 at 12:18:31PM +0530, Selvarasu Ganesan wrote:
>> This commit addresses an issue where the USB core could access an
>> invalid event buffer address during runtime suspend, potentially causing
>> SMMU faults and other memory issues in Exynos platforms. The problem
>> arises from the following sequence.
>>          1. In dwc3_gadget_suspend, there is a chance of a timeout when
>>          moving the USB core to the halt state after clearing the
>>          run/stop bit by software.
>>          2. In dwc3_core_exit, the event buffer is cleared regardless of
>>          the USB core's status, which may lead to an SMMU faults and
>>          other memory issues. if the USB core tries to access the event
>>          buffer address.
>>
>> To prevent this hardware quirk on Exynos platforms, this commit ensures
>> that the event buffer address is not cleared by software  when the USB
>> core is active during runtime suspend by checking its status before
>> clearing the buffer address.
>>
>> Cc: stable@...r.kernel.org # v6.1+
> Any hint as to what commit id this fixes?
>
> thanks,
>
> greg k-h


Hi Greg,

This issue is not related to any particular commit. The given fix is 
address a hardware quirk on the Exynos platform. And we require it to be 
backported on stable kernel 6.1 and above all stable kernel.

Thanks,
Selva


>