From 222722bc6ebfabf5d54467070f05cf9c0a55ea8c Mon Sep 17 00:00:00 2001 From: Yunjian Wang Date: Sat, 10 Jul 2021 11:32:49 +0800 Subject: [PATCH] virtio_net: check virtqueue_add_sgs() return value As virtqueue_add_sgs() can fail, we should check the return value. Addresses-Coverity-ID: 1464439 ("Unchecked return value") Signed-off-by: Yunjian Wang Signed-off-by: David S. Miller --- drivers/net/virtio_net.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index b0b81458ca94..13952e2dba5e 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 +1763,12 @@ 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) { + dev_warn(&vi->vdev->dev, + "Failed to add sgs for command vq: %d\n.", ret); + return false; + } if (unlikely(!virtqueue_kick(vi->cvq))) return vi->ctrl->status == VIRTIO_NET_OK;