linux-kernel - Re: [PATCH v3 13/24] drm/i2c: tda998x: fix a NULL pointer dereference

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Message-ID: <20140122214154.GK15937@n2100.arm.linux.org.uk>
Date:	Wed, 22 Jan 2014 21:41:54 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...il.com>,
	Rob Clark <robdclark@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 13/24] drm/i2c: tda998x: fix a NULL pointer
	dereference

On Sun, Jan 19, 2014 at 07:58:43PM +0100, Jean-Francois Moine wrote:
> This patch fixes a NULL pointer dereference when the set_config
> function has not been called (priv->params == NULL).

No, that's not what this patch is doing.  Maybe you could enlighten me
how priv->params could ever be NULL when that is _not_ a pointer?  That's
completely impossible as it isn't a pointer.

If you tried "priv->params = NULL" the C compiler would barf on it.

I suspect you've misunderstood the code, and this change isn't actually
necessary.

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