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From: Mathias Nyman <mathias.nyman@linux.intel.com>
To: Greg KH <gregkh@linuxfoundation.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Cc: pmenzel@molgen.mpg.de, mika.westerberg@linux.intel.com,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-samsung-soc@vger.kernel.org, krzk@kernel.org,
	stable <stable@vger.kernel.org>
Subject: Re: [RFT PATCH v2] xhci: Fix memory leak when caching protocol extended capability PSI tables
Date: Wed, 12 Feb 2020 11:01:52 +0200	[thread overview]
Message-ID: <a6eedbbf-ce9f-b9c8-beee-a9c941051aeb@linux.intel.com> (raw)
In-Reply-To: <20200211161316.GA1914687@kroah.com>

On 11.2.2020 18.13, Greg KH wrote:
> On Tue, Feb 11, 2020 at 04:12:40PM +0100, Marek Szyprowski wrote:
>> Hi Mathias,
>>
>> On 11.02.2020 16:01, Mathias Nyman wrote:
>>> xhci driver assumed that xHC controllers have at most one custom
>>> supported speed table (PSI) for all usb 3.x ports.
>>> Memory was allocated for one PSI table under the xhci hub structure.
>>>
>>> Turns out this is not the case, some controllers have a separate
>>> "supported protocol capability" entry with a PSI table for each port.
>>> This means each usb3 roothub port can in theory support different custom
>>> speeds.
>>>
>>> To solve this, cache all supported protocol capabilities with their PSI
>>> tables in an array, and add pointers to the xhci port structure so that
>>> every port points to its capability entry in the array.
>>>
>>> When creating the SuperSpeedPlus USB Device Capability BOS descriptor
>>> for the xhci USB 3.1 roothub we for now will use only data from the
>>> first USB 3.1 capable protocol capability entry in the array.
>>> This could be improved later, this patch focuses resolving
>>> the memory leak.
>>>
>>> Reported-by: Paul Menzel <pmenzel@molgen.mpg.de>
>>> Reported-by: Sajja Venkateswara Rao <VenkateswaraRao.Sajja@amd.com>
>>> Fixes: 47189098f8be ("xhci: parse xhci protocol speed ID list for usb 3.1 usage")
>>> Cc: stable <stable@vger.kernel.org> # v4.4+
>>> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
>>
>> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> 
> Nice!
> 
> Should I revert the first and then apply this?
> 

Yes, please

Thanks

-Mathias



  reply	other threads:[~2020-02-12  8:59 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-20  9:44 BUG: KASAN: use-after-free in xhci_trb_virt_to_dma.part.24+0x1c/0x80 Paul Menzel
2018-07-20  9:54 ` Greg KH
2018-07-23 11:23   ` Paul Menzel
2020-01-02 14:10     ` Paul Menzel
2020-01-03 11:04       ` Mika Westerberg
2020-01-07 12:09         ` Mathias Nyman
2020-01-07 15:35           ` Paul Menzel
2020-01-08  9:34             ` Mathias Nyman
2020-01-08 15:17               ` [RFT PATCH] xhci: Fix memory leak when caching protocol extended capability PSI tables Mathias Nyman
2020-01-08 15:40                 ` Greg KH
2020-01-08 15:56                   ` Mathias Nyman
     [not found]                 ` <CGME20200211105613eucas1p27cac4202c4287a5967b2ed988779d523@eucas1p2.samsung.com>
2020-02-11 10:56                   ` Marek Szyprowski
2020-02-11 12:23                     ` Greg KH
2020-02-11 12:29                       ` Mathias Nyman
2020-02-11 14:08                         ` Mathias Nyman
2020-02-11 15:01                           ` [RFT PATCH v2] " Mathias Nyman
2020-02-11 15:12                             ` Marek Szyprowski
2020-02-11 16:13                               ` Greg KH
2020-02-12  9:01                                 ` Mathias Nyman [this message]
2020-02-12 17:51                                   ` Greg KH
2020-02-13 13:33                             ` Jon Hunter
2020-02-14  7:47                               ` Mathias Nyman
2020-02-14  8:35                                 ` Jon Hunter
2020-01-09  8:53         ` BUG: KASAN: use-after-free in xhci_trb_virt_to_dma.part.24+0x1c/0x80 Felipe Balbi

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