From 857ae05549ee2542317e7084ecaa5f8536634dd9 Mon Sep 17 00:00:00 2001
From: Michal Luczaj <mhal@rbox.co>
Date: Thu, 13 Feb 2025 12:58:50 +0100
Subject: [PATCH] vsock/bpf: Warn on socket without transport
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>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
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 53a081d49d28a..7e3db87ae4333 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 f201d9eca1df2..07b96d56f3a57 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;
}
--
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