linux-kernel - [PATCH 5.13 045/127] vDPA/ifcvf: Fix return value check for vdpa_alloc

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Date:   Tue, 24 Aug 2021 12:54:45 -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 5.13 045/127] vDPA/ifcvf: Fix return value check for vdpa_alloc_device()

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

[ Upstream commit 1057afa0121db8bd3ca4718c8e0ca12388ab7759 ]

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: 5a2414bc454e ("virtio: Intel IFC VF driver for VDPA")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Xie Yongji <xieyongji@...edance.com>
Link: https://lore.kernel.org/r/20210715080026.242-3-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/ifcvf/ifcvf_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index ab0ab5cf0f6e..1c6cd5276a50 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -477,9 +477,9 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
 				    dev, &ifc_vdpa_ops, NULL);
-	if (adapter == NULL) {
+	if (IS_ERR(adapter)) {
 		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
-		return -ENOMEM;
+		return PTR_ERR(adapter);
 	}
 
 	pci_set_master(pdev);
-- 
2.30.2