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

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Message-ID: <CAHp75Ve7O6eAiNx0+v_SNR2vuYgnkeWrPD1Umb1afS3pf7m8MQ@mail.gmail.com>
Date: Thu, 29 Aug 2024 17:26:39 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: "Michael S. Tsirkin" <mst@...hat.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 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