From: Sonia Sharma <sosha@xxxxxxxxxxxxxxxxxxx> Sent: Wednesday, September 27, 2023 2:19 PM > Patches to the Hyper-V netvsc driver usually have the patch subject prefix as only "hv_netvsc: ". Look at the commit log for the files in drivers/net/hyperv. There's value in consistency unless someone really thinks we need the "net:" prefix as well. > The switch statement in netvsc_send_completion() is incorrectly validating > the length of incoming network packets by falling through to the next case. > Avoid the fallthrough. Instead break after a case match and then process > the complete() call. > The current code has not caused any known failures. But nonetheless, the > code should be corrected as a different ordering of the switch cases might > cause a length check to fail when it should not. > > Signed-off-by: Sonia Sharma <sonia.sharma@xxxxxxxxxxxxxxxxxxx> > > --- > Changes in v3: > * added return statement in default case as pointed by Michael Kelley. > Changes in v4: > * added fixes tag > * modified commit message to explain the issue fixed by patch. > Changes in v5: > * Dropped fixes tag as suggested by Simon Horman. > * fixed indentation Is there anything different in this v6 versus the previous v5? I received v5 twice -- on 9/26 @ 10:50pm and then on 9/27 @ 2:17pm just a couple of minutes before this v6. Maybe the second v5 was intended to be v6? Is the difference another indentation change? In any case, the code looks good, Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> > --- > drivers/net/hyperv/netvsc.c | 18 ++++++++++-------- > 1 file changed, 10 insertions(+), 8 deletions(-) > > diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c > index 82e9796c8f5e..0f7e4d377776 100644 > --- a/drivers/net/hyperv/netvsc.c > +++ b/drivers/net/hyperv/netvsc.c > @@ -851,7 +851,7 @@ static void netvsc_send_completion(struct net_device *ndev, > msglen); > return; > } > - fallthrough; > + break; > > case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: > if (msglen < sizeof(struct nvsp_message_header) + > @@ -860,7 +860,7 @@ static void netvsc_send_completion(struct net_device *ndev, > msglen); > return; > } > - fallthrough; > + break; > > case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: > if (msglen < sizeof(struct nvsp_message_header) + > @@ -869,7 +869,7 @@ static void netvsc_send_completion(struct net_device *ndev, > msglen); > return; > } > - fallthrough; > + break; > > case NVSP_MSG5_TYPE_SUBCHANNEL: > if (msglen < sizeof(struct nvsp_message_header) + > @@ -878,10 +878,6 @@ static void netvsc_send_completion(struct net_device *ndev, > msglen); > return; > } > - /* Copy the response back */ > - memcpy(&net_device->channel_init_pkt, nvsp_packet, > - sizeof(struct nvsp_message)); > - complete(&net_device->channel_init_wait); > break; > > case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: > @@ -904,13 +900,19 @@ static void netvsc_send_completion(struct net_device > *ndev, > > netvsc_send_tx_complete(ndev, net_device, incoming_channel, > desc, budget); > - break; > + return; > > default: > netdev_err(ndev, > "Unknown send completion type %d received!!\n", > nvsp_packet->hdr.msg_type); > + return; > } > + > + /* Copy the response back */ > + memcpy(&net_device->channel_init_pkt, nvsp_packet, > + sizeof(struct nvsp_message)); > + complete(&net_device->channel_init_wait); > } > > static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) > -- > 2.25.1
