From: Michael Kelley <mikelley@xxxxxxxxxxxxx> [ Upstream commit dca5161f9bd052e9e73be90716ffd57e8762c697 ] Completion responses to SEND_RNDIS_PKT messages are currently processed regardless of the status in the response, so that resources associated with the request are freed. While this is appropriate, code bugs that cause sending a malformed message, or errors on the Hyper-V host, go undetected. Fix this by checking the status and outputting a rate-limited message if there is an error. Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/1676264881-48928-1-git-send-email-mikelley@xxxxxxxxxxxxx Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/hyperv/netvsc.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index fb2448f9a8b17..4156299e039d8 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -814,6 +814,7 @@ static void netvsc_send_completion(struct net_device *ndev, u32 msglen = hv_pkt_datalen(desc); struct nvsp_message *pkt_rqst; u64 cmd_rqst; + u32 status; /* First check if this is a VMBUS completion without data payload */ if (!msglen) { @@ -885,6 +886,23 @@ static void netvsc_send_completion(struct net_device *ndev, break; case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: + if (msglen < sizeof(struct nvsp_message_header) + + sizeof(struct nvsp_1_message_send_rndis_packet_complete)) { + if (net_ratelimit()) + netdev_err(ndev, "nvsp_rndis_pkt_complete length too small: %u\n", + msglen); + return; + } + + /* If status indicates an error, output a message so we know + * there's a problem. But process the completion anyway so the + * resources are released. + */ + status = nvsp_packet->msg.v1_msg.send_rndis_pkt_complete.status; + if (status != NVSP_STAT_SUCCESS && net_ratelimit()) + netdev_err(ndev, "nvsp_rndis_pkt_complete error status: %x\n", + status); + netvsc_send_tx_complete(ndev, net_device, incoming_channel, desc, budget); break; -- 2.39.0
