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Date:   Wed, 26 Aug 2020 08:57:40 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Marek Szyprowski <m.szyprowski@samsung.com>,
        Brooke Basile <brookebasile@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        Ilja Van Sprundel <ivansprundel@ioactive.com>,
        Felipe Balbi <balbi@kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: Re: [GIT PULL] USB fixes for 5.9-rc3
Message-ID: <202008260856.5DAEFCEFF@keescook>
References: <20200826134315.GA3882506@kroah.com>
 <CGME20200826150239eucas1p24c59716cc31edfeb2eece84d97936b93@eucas1p2.samsung.com>
 <1425ab4f-ef7e-97d9-238f-0328ab51eb35@samsung.com>
 <20200826153347.GB4187816@kroah.com>
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On Wed, Aug 26, 2020 at 05:33:47PM +0200, Greg KH wrote:
> On Wed, Aug 26, 2020 at 05:02:38PM +0200, Marek Szyprowski wrote:
> > Hi Greg,
> > 
> > On 26.08.2020 15:43, Greg KH wrote:
> > > The following changes since commit 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5:
> > >
> > >    Linux 5.9-rc1 (2020-08-16 13:04:57 -0700)
> > >
> > > are available in the Git repository at:
> > >
> > >    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git tags/usb-5.9-rc3
> > >
> > > for you to fetch changes up to 23e26d0577535f5ffe4ff8ed6d06e009553c0bca:
> > >
> > >    usb: typec: tcpm: Fix Fix source hard reset response for TDA 2.3.1.1 and TDA 2.3.1.2 failures (2020-08-25 16:02:35 +0200)
> > >
> > > ----------------------------------------------------------------
> > > USB fixes for 5.9-rc3
> > >
> > > Here are a small set of USB fixes for 5.9-rc3.
> > >
> > > Like most set of USB bugfixes, they include the usual:
> > > 	- usb gadget driver fixes
> > > 	- xhci driver fixes
> > > 	- typec fixes
> > > 	- new qurks and ids
> > > 	- fixes for USB patches merged in 5.9-rc1
> > >
> > > Nothing huge, all of these have been in linux-next with no reported
> > > issues:
> > >
> > > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > >
> > > ----------------------------------------------------------------
> > > Alan Stern (1):
> > >        USB: yurex: Fix bad gfp argument
> > >
> > > Andy Shevchenko (1):
> > >        usb: hcd: Fix use after free in usb_hcd_pci_remove()
> > >
> > > Badhri Jagan Sridharan (1):
> > >        usb: typec: tcpm: Fix Fix source hard reset response for TDA 2.3.1.1 and TDA 2.3.1.2 failures
> > >
> > > Bastien Nocera (2):
> > >        USB: Also match device drivers using the ->match vfunc
> > >        USB: Fix device driver race
> > >
> > > Brooke Basile (2):
> > >        USB: gadget: u_f: add overflow checks to VLA macros
> > 
> > Sorry, but the above patch breaks USB Ethernet Gadget operation. It also 
> > didn't get the proper testing in linux-next (next-20200826 is the first 
> > one with this patch).
> > 
> > This is how it explodes on Samsung Exynos (ARM 32bit) based board with 
> > g_ether module loaded:
> > 
> > ------------[ cut here ]------------
> > kernel BUG at mm/slub.c:4116!
> 
> Why is slub.c erroring?  How is this related to freeing memory?

I assume this is related to the size calculations in the VLA macros...
nothing _looks_ wrong with that patch, but obviously something is. :)
Hmmm

-- 
Kees Cook