From: Stefano Garzarella <sgarzare@redhat.com> To: kuba@kernel.org Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Asias He <asias@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>, Stefan Hajnoczi <stefanha@redhat.com>, Stefano Garzarella <sgarzare@redhat.com> Subject: [PATCH net] vsock/virtio: update credit only if socket is not closed Date: Mon, 8 Feb 2021 15:44:54 +0100 [thread overview] Message-ID: <20210208144454.84438-1-sgarzare@redhat.com> (raw) If the socket is closed or is being released, some resources used by virtio_transport_space_update() such as 'vsk->trans' may be released. To avoid a use after free bug we should only update the available credit when we are sure the socket is still open and we have the lock held. Fixes: 06a8fc78367d ("VSOCK: Introduce virtio_vsock_common.ko") Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> --- net/vmw_vsock/virtio_transport_common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 5956939eebb7..e4370b1b7494 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -1130,8 +1130,6 @@ void virtio_transport_recv_pkt(struct virtio_transport *t, vsk = vsock_sk(sk); - space_available = virtio_transport_space_update(sk, pkt); - lock_sock(sk); /* Check if sk has been closed before lock_sock */ @@ -1142,6 +1140,8 @@ void virtio_transport_recv_pkt(struct virtio_transport *t, goto free_pkt; } + space_available = virtio_transport_space_update(sk, pkt); + /* Update CID in case it has changed after a transport reset event */ vsk->local_addr.svm_cid = dst.svm_cid; -- 2.29.2
WARNING: multiple messages have this Message-ID (diff)
From: Stefano Garzarella <sgarzare@redhat.com> To: kuba@kernel.org Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Stefan Hajnoczi <stefanha@redhat.com>, Asias He <asias@redhat.com>, Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>, "David S. Miller" <davem@davemloft.net> Subject: [PATCH net] vsock/virtio: update credit only if socket is not closed Date: Mon, 8 Feb 2021 15:44:54 +0100 [thread overview] Message-ID: <20210208144454.84438-1-sgarzare@redhat.com> (raw) If the socket is closed or is being released, some resources used by virtio_transport_space_update() such as 'vsk->trans' may be released. To avoid a use after free bug we should only update the available credit when we are sure the socket is still open and we have the lock held. Fixes: 06a8fc78367d ("VSOCK: Introduce virtio_vsock_common.ko") Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> --- net/vmw_vsock/virtio_transport_common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 5956939eebb7..e4370b1b7494 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -1130,8 +1130,6 @@ void virtio_transport_recv_pkt(struct virtio_transport *t, vsk = vsock_sk(sk); - space_available = virtio_transport_space_update(sk, pkt); - lock_sock(sk); /* Check if sk has been closed before lock_sock */ @@ -1142,6 +1140,8 @@ void virtio_transport_recv_pkt(struct virtio_transport *t, goto free_pkt; } + space_available = virtio_transport_space_update(sk, pkt); + /* Update CID in case it has changed after a transport reset event */ vsk->local_addr.svm_cid = dst.svm_cid; -- 2.29.2 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next reply other threads:[~2021-02-08 14:51 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-08 14:44 Stefano Garzarella [this message] 2021-02-08 14:44 ` [PATCH net] vsock/virtio: update credit only if socket is not closed Stefano Garzarella 2021-02-08 18:32 ` Michael S. Tsirkin 2021-02-08 18:32 ` Michael S. Tsirkin 2021-02-08 21:40 ` patchwork-bot+netdevbpf
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