netdev - [PATCH net] virtio_net: check virtqueue_add

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Date:   Mon, 5 Jul 2021 21:53:39 +0800
From:   wangyunjian <wangyunjian@...wei.com>
To:     <kuba@...nel.org>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <mst@...hat.com>, <jasowang@...hat.com>,
        <dingxiaoxiong@...wei.com>, Yunjian Wang <wangyunjian@...wei.com>
Subject: [PATCH net] virtio_net: check virtqueue_add_sgs() return value

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

As virtqueue_add_sgs() can fail, we should check the return value.

Addresses-Coverity-ID: 1464439 ("Unchecked return value")
Fixes: a7c58146cf9a ("virtio_net: don't crash if virtqueue is broken.")
Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
---
 drivers/net/virtio_net.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index b0b81458ca94..2b852578551e 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1743,6 +1743,7 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
 {
 	struct scatterlist *sgs[4], hdr, stat;
 	unsigned out_num = 0, tmp;
+	int ret;
 
 	/* Caller should know better */
 	BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
@@ -1762,7 +1763,9 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
 	sgs[out_num] = &stat;
 
 	BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
-	virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
+	ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
+	if (ret < 0)
+		return false;
 
 	if (unlikely(!virtqueue_kick(vi->cvq)))
 		return vi->ctrl->status == VIRTIO_NET_OK;
-- 
2.23.0