linux-kernel - [PATCH 5.13 044/127] vp_vdpa: Fix return value check for vdpa_alloc

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Date:   Tue, 24 Aug 2021 12:54:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xie Yongji <xieyongji@...edance.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 044/127] vp_vdpa: Fix return value check for vdpa_alloc_device()

From: Xie Yongji <xieyongji@...edance.com>

[ Upstream commit 9632e78e82648aa98340df78eab9106f63da151e ]

The vdpa_alloc_device() returns an error pointer upon
failure, not NULL. To handle the failure correctly, this
replaces NULL check with IS_ERR() check and propagate the
error upwards.

Fixes: 64b9f64f80a6 ("vdpa: introduce virtio pci driver")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Xie Yongji <xieyongji@...edance.com>
Link: https://lore.kernel.org/r/20210715080026.242-2-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vdpa/virtio_pci/vp_vdpa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
index 9145e0624565..54b313e4e63f 100644
--- a/drivers/vdpa/virtio_pci/vp_vdpa.c
+++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
@@ -400,9 +400,9 @@ static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa,
 				    dev, &vp_vdpa_ops, NULL);
-	if (vp_vdpa == NULL) {
+	if (IS_ERR(vp_vdpa)) {
 		dev_err(dev, "vp_vdpa: Failed to allocate vDPA structure\n");
-		return -ENOMEM;
+		return PTR_ERR(vp_vdpa);
 	}
 
 	mdev = &vp_vdpa->mdev;
-- 
2.30.2