linux-kernel - Re: [PATCH RESEND] vdpa: solidrun: Fix UB bug with devres

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Message-ID: <Zw-CqayFcWzOwci_@smile.fi.intel.com>
Date: Wed, 16 Oct 2024 12:08:57 +0300
From: Andy Shevchenko <andy@...nel.org>
To: Philipp Stanner <pstanner@...hat.com>
Cc: Alvaro Karsz <alvaro.karsz@...id-run.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: Re: [PATCH RESEND] vdpa: solidrun: Fix UB bug with devres

On Wed, Oct 16, 2024 at 09:25:54AM +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().

> ---

I haven't found the reason for resending. Can you elaborate here?

-- 
With Best Regards,
Andy Shevchenko