linux-kernel - [PATCH] drm/virtio: Fix NULL vs IS_ERR checking in virtio_gpu_object_shmem

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Date:   Wed, 22 Dec 2021 07:26:49 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linmq006@...il.com, David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/virtio: Fix NULL vs IS_ERR checking in virtio_gpu_object_shmem_init

Since drm_prime_pages_to_sg() function return error pointers.
The drm_gem_shmem_get_sg_table() function returns error pointers too.
Using IS_ERR() to check the return value to fix this.

Fixes: f651c8b05542("drm/virtio: factor out the sg_table from virtio_gpu_object")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index f648b0e24447..8bb80289672c 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -168,9 +168,9 @@ 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.base);
-	if (!shmem->pages) {
+	if (IS_ERR(shmem->pages)) {
 		drm_gem_shmem_unpin(&bo->base.base);
-		return -EINVAL;
+		return PTR_ERR(shmem->pages);
 	}
 
 	if (use_dma_api) {
-- 
2.17.1