linux-kernel - Re: [PATCH] drm/atomic: fix null dereference

Open Source and information security mailing list archives

Message-ID: <CAF6AEGsCWrDugJeqCeodFdygyX3DS2Xf-cBQEEqkOcEKdMtoWA@mail.gmail.com>
Date:	Sat, 11 Jul 2015 14:17:49 -0400
From:	Rob Clark <robdclark@...il.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	David Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/atomic: fix null dereference

On Sat, Jul 11, 2015 at 1:24 PM, Sudip Mukherjee
<sudipm.mukherjee@...il.com> wrote:
> We are checking the size of e->event but we were doing it when e is
> known to be NULL.

nak, this will leak event_space..  since it is a sizeof, it isn't
actually deref'ing e, but rather just using the static type info, so
it's ok (although perhaps funny looking)

BR,
-R

> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
>  drivers/gpu/drm/drm_atomic.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index acebd16..51d3a85 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1311,7 +1311,6 @@ static struct drm_pending_vblank_event *create_vblank_event(
>         e = kzalloc(sizeof *e, GFP_KERNEL);
>         if (e == NULL) {
>                 spin_lock_irqsave(&dev->event_lock, flags);
> -               file_priv->event_space += sizeof e->event;
>                 spin_unlock_irqrestore(&dev->event_lock, flags);
>                 goto out;
>         }
> --
> 1.8.1.2
>
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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