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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Eric Dumazet <eric.dumazet@gmail.com>,
        Norbert Slusarek <nslusarek@gmx.net>,
        Stefano Garzarella <sgarzare@redhat.com>,
        Jakub Kicinski <kuba@kernel.org>
Subject: [PATCH 4.9 31/49] net/vmw_vsock: improve locking in vsock_connect_timeout()
Date:   Mon, 22 Feb 2021 13:36:29 +0100
Message-Id: <20210222121027.241105561@linuxfoundation.org>
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From: Norbert Slusarek <nslusarek@gmx.net>

commit 3d0bc44d39bca615b72637e340317b7899b7f911 upstream.

A possible locking issue in vsock_connect_timeout() was recognized by
Eric Dumazet which might cause a null pointer dereference in
vsock_transport_cancel_pkt(). This patch assures that
vsock_transport_cancel_pkt() will be called within the lock, so a race
condition won't occur which could result in vsk->transport to be set to NULL.

Fixes: 380feae0def7 ("vsock: cancel packets when failing to connect")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Norbert Slusarek <nslusarek@gmx.net>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/trinity-f8e0937a-cf0e-4d80-a76e-d9a958ba3ef1-1612535522360@3c-app-gmx-bap12
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/vmw_vsock/af_vsock.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1121,7 +1121,6 @@ static void vsock_connect_timeout(struct
 {
 	struct sock *sk;
 	struct vsock_sock *vsk;
-	int cancel = 0;
 
 	vsk = container_of(work, struct vsock_sock, connect_work.work);
 	sk = sk_vsock(vsk);
@@ -1132,11 +1131,9 @@ static void vsock_connect_timeout(struct
 		sk->sk_state = SS_UNCONNECTED;
 		sk->sk_err = ETIMEDOUT;
 		sk->sk_error_report(sk);
-		cancel = 1;
+		vsock_transport_cancel_pkt(vsk);
 	}
 	release_sock(sk);
-	if (cancel)
-		vsock_transport_cancel_pkt(vsk);
 
 	sock_put(sk);
 }