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[212.51.149.33]) by smtp.gmail.com with ESMTPSA id p8-20020a1c5448000000b003a63a3b55c3sm22643853wmi.14.2022.09.06.12.25.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Sep 2022 12:25:20 -0700 (PDT) Date: Tue, 6 Sep 2022 21:25:18 +0200 From: Daniel Vetter To: Alisa Khabibrakhmanova Subject: Re: [PATCH] drm/via: Add new condition to via_dma_cleanup() Message-ID: Mail-Followup-To: Alisa Khabibrakhmanova , David Airlie , Thomas Zimmermann , Sam Ravnborg , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, ldv-project@linuxtesting.org References: <20220729090643.240778-1-khabibrakhmanova@ispras.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220729090643.240778-1-khabibrakhmanova@ispras.ru> X-Operating-System: Linux phenom 5.18.0-4-amd64 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ldv-project@linuxtesting.org, David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Thomas Zimmermann , Sam Ravnborg Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri, Jul 29, 2022 at 12:06:43PM +0300, Alisa Khabibrakhmanova wrote: > Pointer dev_priv->mmio, which was checked for NULL at via_do_init_map(), > is passed to via_do_cleanup_map() and is dereferenced there without check. > > The patch adds the condition in via_dma_cleanup() which prevents potential NULL > pointer dereference. > > Found by Linux Verification Center (linuxtesting.org) with SVACE. > > Fixes: 22f579c621e2 ("drm: Add via unichrome support") > Signed-off-by: Alisa Khabibrakhmanova This seems to have fallen through cracks, I applied it to drm-misc-next now. Thanks for your patch. -Daniel > --- > drivers/gpu/drm/via/via_dri1.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/via/via_dri1.c b/drivers/gpu/drm/via/via_dri1.c > index d695d9291ece..691e3ceb0062 100644 > --- a/drivers/gpu/drm/via/via_dri1.c > +++ b/drivers/gpu/drm/via/via_dri1.c > @@ -2961,7 +2961,7 @@ int via_dma_cleanup(struct drm_device *dev) > drm_via_private_t *dev_priv = > (drm_via_private_t *) dev->dev_private; > > - if (dev_priv->ring.virtual_start) { > + if (dev_priv->ring.virtual_start && dev_priv->mmio) { > via_cmdbuf_reset(dev_priv); > > drm_legacy_ioremapfree(&dev_priv->ring.map, dev); > -- > 2.34.1 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch