linux-kernel - [PATCH AUTOSEL for 4.14 066/100] virtio_net: fix return value check in receive

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Message-ID: <20180128222547.7398-66-alexander.levin@microsoft.com>
Date:   Sun, 28 Jan 2018 22:26:42 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Yunjian Wang <wangyunjian@...wei.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 066/100] virtio_net: fix return value check
 in receive_mergeable()

From: Yunjian Wang <wangyunjian@...wei.com>

[ Upstream commit 03e9f8a05bce7330bcd9c5cc54c8e42d0fcbf993 ]

The function virtqueue_get_buf_ctx() could return NULL, the return
value 'buf' need to be checked with NULL, not value 'ctx'.

Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/virtio_net.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 511f8339fa96..7927e28f5336 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -714,7 +714,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 		int num_skb_frags;
 
 		buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx);
-		if (unlikely(!ctx)) {
+		if (unlikely(!buf)) {
 			pr_debug("%s: rx error: %d buffers out of %d missing\n",
 				 dev->name, num_buf,
 				 virtio16_to_cpu(vi->vdev,
-- 
2.11.0