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From:   Dmitry Osipenko <dmitry.osipenko@collabora.com>
To:     David Airlie <airlied@linux.ie>, Gerd Hoffmann <kraxel@redhat.com>,
        Gurchetan Singh <gurchetansingh@chromium.org>,
        Chia-I Wu <olvaffe@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
        Daniel Almeida <daniel.almeida@collabora.com>,
        Gert Wollny <gert.wollny@collabora.com>
Cc:     dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        Gustavo Padovan <gustavo.padovan@collabora.com>,
        Daniel Stone <daniel@fooishbar.org>,
        Tomeu Vizoso <tomeu.vizoso@collabora.com>,
        virtualization@lists.linux-foundation.org,
        Dmitry Osipenko <digetx@gmail.com>
Subject: [PATCH v1 1/5] drm/virtio: Correct drm_gem_shmem_get_sg_table() error handling
Date:   Tue,  8 Mar 2022 16:17:21 +0300
Message-Id: <20220308131725.60607-2-dmitry.osipenko@collabora.com>
In-Reply-To: <20220308131725.60607-1-dmitry.osipenko@collabora.com>
References: <20220308131725.60607-1-dmitry.osipenko@collabora.com>
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drm_gem_shmem_get_sg_table() never ever returned NULL on error. Correct
the error handling to avoid crash on OOM.

Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index f293e6ad52da..bea7806a3ae3 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -168,9 +168,11 @@ static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
 	 * since virtio_gpu doesn't support dma-buf import from other devices.
 	 */
 	shmem->pages = drm_gem_shmem_get_sg_table(&bo->base);
-	if (!shmem->pages) {
+	ret = PTR_ERR(shmem->pages);
+	if (ret) {
 		drm_gem_shmem_unpin(&bo->base);
-		return -EINVAL;
+		shmem->pages = NULL;
+		return ret;
 	}
 
 	if (use_dma_api) {
-- 
2.35.1