linux-kernel - Re: [PATCH] [v3] drm/imx: imx-ldb: fix out of bounds array access warning

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Message-ID: <20210325070854.GC22419@pengutronix.de>
Date:   Thu, 25 Mar 2021 08:08:54 +0100
From:   Philipp Zabel <pza@...gutronix.de>
To:     Liu Ying <victor.liu@....com>
Cc:     Arnd Bergmann <arnd@...nel.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Arnd Bergmann <arnd@...db.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Sam Ravnborg <sam@...nborg.org>, Joe Perches <joe@...ches.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v3] drm/imx: imx-ldb: fix out of bounds array access
 warning

On Thu, Mar 25, 2021 at 10:03:23AM +0800, Liu Ying wrote:
> On Wed, 2021-03-24 at 17:47 +0100, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > When CONFIG_OF is disabled, building with 'make W=1' produces warnings
> > about out of bounds array access:
> > 
> > drivers/gpu/drm/imx/imx-ldb.c: In function 'imx_ldb_set_clock.constprop':
> > drivers/gpu/drm/imx/imx-ldb.c:186:8: error: array subscript -22 is below array bounds of 'struct clk *[4]' [-Werror=array-bounds]
> > 
> > Add an error check before the index is used, which helps with the
> > warning, as well as any possible other error condition that may be
> > triggered at runtime.
> > 
> > The warning could be fixed by adding a Kconfig depedency on CONFIG_OF,
> > but Liu Ying points out that the driver may hit the out-of-bounds
> > problem at runtime anyway.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Reviewed-by: Liu Ying <victor.liu@....com>

Thank you, applied to imx-drm/fixes.

regards
Philipp