linux-kernel - Re: [PATCH v5 6/7] vdpa: solidrun: Fix UB bug with devres

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Message-ID: <20240829104124-mutt-send-email-mst@kernel.org>
Date: Thu, 29 Aug 2024 10:41:57 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Philipp Stanner <pstanner@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Wu Hao <hao.wu@...el.com>, Tom Rix <trix@...hat.com>,
	Moritz Fischer <mdf@...nel.org>, Xu Yilun <yilun.xu@...el.com>,
	Andy Shevchenko <andy@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Alvaro Karsz <alvaro.karsz@...id-run.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Damien Le Moal <dlemoal@...nel.org>, Hannes Reinecke <hare@...e.de>,
	John Garry <john.g.garry@...cle.com>, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fpga@...r.kernel.org,
	linux-gpio@...r.kernel.org, netdev@...r.kernel.org,
	linux-pci@...r.kernel.org, virtualization@...ts.linux.dev,
	stable@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: Re: [PATCH v5 6/7] vdpa: solidrun: Fix UB bug with devres

On Thu, Aug 29, 2024 at 05:26:39PM +0300, Andy Shevchenko wrote:
> On Thu, Aug 29, 2024 at 5:23 PM Michael S. Tsirkin <mst@...hat.com> wrote:
> >
> > On Thu, Aug 29, 2024 at 04:16:25PM +0200, Philipp Stanner wrote:
> > > In psnet_open_pf_bar() and snet_open_vf_bar() a string later passed to
> > > pcim_iomap_regions() is placed on the stack. Neither
> > > pcim_iomap_regions() nor the functions it calls copy that string.
> > >
> > > Should the string later ever be used, this, consequently, causes
> > > undefined behavior since the stack frame will by then have disappeared.
> > >
> > > Fix the bug by allocating the strings on the heap through
> > > devm_kasprintf().
> > >
> > > Cc: stable@...r.kernel.org    # v6.3
> > > Fixes: 51a8f9d7f587 ("virtio: vdpa: new SolidNET DPU driver.")
> > > Reported-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> > > Closes: https://lore.kernel.org/all/74e9109a-ac59-49e2-9b1d-d825c9c9f891@wanadoo.fr/
> > > Suggested-by: Andy Shevchenko <andy@...nel.org>
> > > Signed-off-by: Philipp Stanner <pstanner@...hat.com>
> >
> > Post this separately, so I can apply?
> 
> Don't you use `b4`? With it it as simple as
> 
>   b4 am -P 6 $MSG_ID_OF_THIS_SERIES
> 
> -- 
> With Best Regards,
> Andy Shevchenko

I can do all kind of things, but if it's posted as part of a patchset,
it is not clear to me this has been tested outside of the patchset.

-- 
MST