4.14-stable review patch.  If anyone has any objections, please let me know.


From: Yunjian Wang <wangyunj...@huawei.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 <wangyunj...@huawei.com>
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 drivers/net/virtio_net.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -714,7 +714,7 @@ static struct sk_buff *receive_mergeable
                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,

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