linux-kernel - Re: [PATCH] drm/radeon: fix copy of uninitialized variable back to userspace

Open Source and information security mailing list archives

Date:   Wed, 3 Mar 2021 10:03:21 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Christian König <christian.koenig@....com>
Cc:     Colin King <colin.king@...onical.com>,
        Alex Deucher <alexander.deucher@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Marek Olšák <marek.olsak@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: fix copy of uninitialized variable back to userspace

Applied.  Thanks!

Alex

On Wed, Mar 3, 2021 at 2:42 AM Christian König <christian.koenig@....com> wrote:
>
> Am 03.03.21 um 01:27 schrieb Colin King:
> > From: Colin Ian King <colin.king@...onical.com>
> >
> > Currently the ioctl command RADEON_INFO_SI_BACKEND_ENABLED_MASK can
> > copy back uninitialised data in value_tmp that pointer *value points
> > to. This can occur when rdev->family is less than CHIP_BONAIRE and
> > less than CHIP_TAHITI.  Fix this by adding in a missing -EINVAL
> > so that no invalid value is copied back to userspace.
> >
> > Addresses-Coverity: ("Uninitialized scalar variable)
> > Cc: stable@...r.kernel.org # 3.13+
> > Fixes: 439a1cfffe2c ("drm/radeon: expose render backend mask to the userspace")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
>
> Reviewed-by: Christian König <christian.koenig@....com>
>
> Let's hope that this doesn't break UAPI.
>
> Christian.
>
> > ---
> >   drivers/gpu/drm/radeon/radeon_kms.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> > index 2479d6ab7a36..58876bb4ef2a 100644
> > --- a/drivers/gpu/drm/radeon/radeon_kms.c
> > +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> > @@ -518,6 +518,7 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
> >                       *value = rdev->config.si.backend_enable_mask;
> >               } else {
> >                       DRM_DEBUG_KMS("BACKEND_ENABLED_MASK is si+ only!\n");
> > +                     return -EINVAL;
> >               }
> >               break;
> >       case RADEON_INFO_MAX_SCLK:
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx

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