[PATCH net 2/4] vsock/bpf: Warn on socket without transport

[Michal Luczaj <mhal@rbox.co>]

In the spirit of commit 91751e248256 ("vsock: prevent null-ptr-deref in
vsock_*[has_data|has_space]"), armorize the "impossible" cases with a
warning.

Fixes: 634f1a7110b4 ("vsock: support sockmap")
Signed-off-by: Michal Luczaj <mhal@rbox.co>
---
 net/vmw_vsock/af_vsock.c  | 3 +++
 net/vmw_vsock/vsock_bpf.c | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 53a081d49d28ac1c04e7f8057c8a55e7b73cc131..7e3db87ae4333cf63327ec105ca99253569bb9fe 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1189,6 +1189,9 @@ static int vsock_read_skb(struct sock *sk, skb_read_actor_t read_actor)
 {
 	struct vsock_sock *vsk = vsock_sk(sk);
 
+	if (WARN_ON_ONCE(!vsk->transport))
+		return -ENODEV;
+
 	return vsk->transport->read_skb(vsk, read_actor);
 }
 
diff --git a/net/vmw_vsock/vsock_bpf.c b/net/vmw_vsock/vsock_bpf.c
index f201d9eca1df2f8143638cf7a4d08671e8368c11..07b96d56f3a577af71021b1b8132743554996c4f 100644
--- a/net/vmw_vsock/vsock_bpf.c
+++ b/net/vmw_vsock/vsock_bpf.c
@@ -87,7 +87,7 @@ static int vsock_bpf_recvmsg(struct sock *sk, struct msghdr *msg,
 	lock_sock(sk);
 	vsk = vsock_sk(sk);
 
-	if (!vsk->transport) {
+	if (WARN_ON_ONCE(!vsk->transport)) {
 		copied = -ENODEV;
 		goto out;
 	}

-- 
2.48.1