Return a negative error code if the transport doesn't match.  Don't
return success.

Fixes: c0cfa2d8a788 ("vsock: add multi-transports support")
Cc: stable@vger.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
From static analysis.  Not tested.

 net/vmw_vsock/virtio_transport_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index dcc8a1d5851e..77fbc6c541bf 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -1550,7 +1550,7 @@ virtio_transport_recv_listen(struct sock *sk, struct sk_buff *skb,
 		release_sock(child);
 		virtio_transport_reset_no_sock(t, skb);
 		sock_put(child);
-		return ret;
+		return ret ?: -EINVAL;
 	}
 
 	if (virtio_transport_space_update(child, skb))
-- 
2.51.0

On Thu, Dec 11, 2025 at 10:45:47AM +0300, Dan Carpenter wrote:
>Return a negative error code if the transport doesn't match.  Don't
>return success.
>
>Fixes: c0cfa2d8a788 ("vsock: add multi-transports support")
>Cc: stable@vger.kernel.org
>Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
>---
>From static analysis.  Not tested.
>
> net/vmw_vsock/virtio_transport_common.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
>index dcc8a1d5851e..77fbc6c541bf 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -1550,7 +1550,7 @@ virtio_transport_recv_listen(struct sock *sk, struct sk_buff *skb,
> 		release_sock(child);
> 		virtio_transport_reset_no_sock(t, skb);
> 		sock_put(child);
>-		return ret;
>+		return ret ?: -EINVAL;

Thanks for this fix. I think we have a similar issue also in 
net/vmw_vsock/vmci_transport.c introduced by the same commit.
In net/vmw_vsock/hyperv_transport.c we have a similar pattern, but the 
calling function return void, so no issue there.

Do you mind to fix also that one?

Sending a v2 to fix both or another patch just for that it's fine by me,
so:

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

On Thu, Dec 11, 2025 at 09:30:06AM +0100, Stefano Garzarella wrote:
> On Thu, Dec 11, 2025 at 10:45:47AM +0300, Dan Carpenter wrote:
> > Return a negative error code if the transport doesn't match.  Don't
> > return success.
> > 
> > Fixes: c0cfa2d8a788 ("vsock: add multi-transports support")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> > ---
> > From static analysis.  Not tested.
> > 
> > net/vmw_vsock/virtio_transport_common.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> > index dcc8a1d5851e..77fbc6c541bf 100644
> > --- a/net/vmw_vsock/virtio_transport_common.c
> > +++ b/net/vmw_vsock/virtio_transport_common.c
> > @@ -1550,7 +1550,7 @@ virtio_transport_recv_listen(struct sock *sk, struct sk_buff *skb,
> > 		release_sock(child);
> > 		virtio_transport_reset_no_sock(t, skb);
> > 		sock_put(child);
> > -		return ret;
> > +		return ret ?: -EINVAL;
> 
> Thanks for this fix. I think we have a similar issue also in
> net/vmw_vsock/vmci_transport.c introduced by the same commit.
> In net/vmw_vsock/hyperv_transport.c we have a similar pattern, but the
> calling function return void, so no issue there.
> 
> Do you mind to fix also that one?

Sure.  I will resend a v2.

The check doesn't catch that one because the != comparison is
hidden inside the vmci_check_transport() call.  So I would have missed
it.  Thanks for catching it.

regards,
dan carpenter

On Thu, Dec 11, 2025 at 10:45:47AM +0300, Dan Carpenter wrote:
> Return a negative error code if the transport doesn't match.  Don't
> return success.
> 
> Fixes: c0cfa2d8a788 ("vsock: add multi-transports support")
> Cc: stable@vger.kernel.org
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>


Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
> >From static analysis.  Not tested.
> 
>  net/vmw_vsock/virtio_transport_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> index dcc8a1d5851e..77fbc6c541bf 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -1550,7 +1550,7 @@ virtio_transport_recv_listen(struct sock *sk, struct sk_buff *skb,
>  		release_sock(child);
>  		virtio_transport_reset_no_sock(t, skb);
>  		sock_put(child);
> -		return ret;
> +		return ret ?: -EINVAL;
>  	}
>  
>  	if (virtio_transport_space_update(child, skb))
> -- 
> 2.51.0