diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2024-10-02 16:35:20 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2024-10-07 18:47:55 +0300 |
| commit | a194c985973276b2f280428c848f20369bb83734 (patch) | |
| tree | b7f027a729a11184b7a3e5814937349f4a82f241 /net | |
| parent | b9efbe2b8f0177fa97bfab290d60858900aa196b (diff) | |
| download | linux-a194c985973276b2f280428c848f20369bb83734.tar.xz | |
vsock/virtio: use GFP_ATOMIC under RCU read lock
virtio_transport_send_pkt in now called on transport fast path,
under RCU read lock. In that case, we have a bug: virtio_add_sgs
is called with GFP_KERNEL, and might sleep.
Pass the gfp flags as an argument, and use GFP_ATOMIC on
the fast path.
Link: https://lore.kernel.org/all/hfcr2aget2zojmqpr4uhlzvnep4vgskblx5b6xf2ddosbsrke7@nt34bxgp7j2x
Fixes: efcd71af38be ("vsock/virtio: avoid queuing packets when intermediate queue is empty")
Reported-by: Christian Brauner <brauner@kernel.org>
Cc: Stefano Garzarella <sgarzare@redhat.com>
Cc: Luigi Leonardi <luigi.leonardi@outlook.com>
Message-ID: <3fbfb6e871f625f89eb578c7228e127437b1975a.1727876449.git.mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Luigi Leonardi <luigi.leonardi@outlook.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/vmw_vsock/virtio_transport.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index f992f9a216f0..0cd965f24609 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -96,7 +96,7 @@ out_rcu: /* Caller need to hold vsock->tx_lock on vq */ static int virtio_transport_send_skb(struct sk_buff *skb, struct virtqueue *vq, - struct virtio_vsock *vsock) + struct virtio_vsock *vsock, gfp_t gfp) { int ret, in_sg = 0, out_sg = 0; struct scatterlist **sgs; @@ -140,7 +140,7 @@ static int virtio_transport_send_skb(struct sk_buff *skb, struct virtqueue *vq, } } - ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, skb, GFP_KERNEL); + ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, skb, gfp); /* Usually this means that there is no more space available in * the vq */ @@ -178,7 +178,7 @@ virtio_transport_send_pkt_work(struct work_struct *work) reply = virtio_vsock_skb_reply(skb); - ret = virtio_transport_send_skb(skb, vq, vsock); + ret = virtio_transport_send_skb(skb, vq, vsock, GFP_KERNEL); if (ret < 0) { virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb); break; @@ -221,7 +221,7 @@ static int virtio_transport_send_skb_fast_path(struct virtio_vsock *vsock, struc if (unlikely(ret == 0)) return -EBUSY; - ret = virtio_transport_send_skb(skb, vq, vsock); + ret = virtio_transport_send_skb(skb, vq, vsock, GFP_ATOMIC); if (ret == 0) virtqueue_kick(vq); |