Re: [PATCH] USB: core: Add type-specific length check of BOS descriptors

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On Thu, 9 Nov 2017 17:47:01 +0100
Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:

> On Fri, Nov 10, 2017 at 01:25:50AM +0900, Masakazu Mokuno wrote:
> > 
> > As most of BOS descriptors are longer in length than their header
> > 'struct usb_dev_cap_header', comparing solely with it is not sufficient
> > to avoid out-of-bounds access to BOS descriptors.
> > 
> > This patch adds descriptor type specific length check in
> > usb_get_bos_descriptor() to fix the issue.
> > 
> > Signed-off-by: Masakazu Mokuno <masakazu.mokuno@xxxxxxxxx>
> 
> So is the current code "broken" somehow, and this patch should be
> backported to the stable kernels?

Though I haven't checked stable kernels, I guess they have similar issue.

-- 
Masakazu Mokuno
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