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From: "Michael S. Tsirkin" <mst@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Rusty Russell <rusty@rustcorp.com.au>,
	virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org
Subject: [PATCH 16/16] virtio_net: fix use after free on allocation failure
Date: Sun, 5 Oct 2014 19:07:38 +0300	[thread overview]
Message-ID: <1412525038-15871-17-git-send-email-mst@redhat.com> (raw)
In-Reply-To: <1412525038-15871-1-git-send-email-mst@redhat.com>

In the extremely unlikely event that driver initialization fails after
RX buffers are added, virtio net frees RX buffers while VQs are
still active, potentially causing device to use a freed buffer.

To fix, reset device first - same as we do on device removal.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 drivers/net/virtio_net.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7afc990..85e6098 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1830,6 +1830,8 @@ static int virtnet_probe(struct virtio_device *vdev)
 	return 0;
 
 free_recv_bufs:
+	vi->vdev->config->reset(vdev);
+
 	free_receive_bufs(vi);
 	unregister_netdev(dev);
 free_vqs:
-- 
MST


  parent reply	other threads:[~2014-10-05 16:04 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-05 16:06 [PATCH 00/16] virtio: fix spec compliance issues Michael S. Tsirkin
2014-10-05 16:06 ` [PATCH 01/16] virtio_pci: fix virtio spec compliance on restore Michael S. Tsirkin
2014-10-05 16:06 ` [PATCH 02/16] virtio: unify config_changed handling Michael S. Tsirkin
2014-10-06  9:20   ` Cornelia Huck
2014-10-05 16:06 ` [PATCH 03/16] virtio: refactor to use drv_to_virtio Michael S. Tsirkin
2014-10-06 10:34   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 04/16] virtio-pci: move freeze/restore to virtio core Michael S. Tsirkin
2014-10-06 10:54   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 05/16] virtio: defer config changed notifications Michael S. Tsirkin
2014-10-06 11:33   ` Cornelia Huck
2014-10-06 12:00     ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 06/16] virtio_blk: drop config_enable Michael S. Tsirkin
2014-10-06 11:42   ` Cornelia Huck
2014-10-06 12:09     ` Michael S. Tsirkin
2014-10-06 12:20       ` Cornelia Huck
2014-10-06 12:31         ` Michael S. Tsirkin
2014-10-06 12:55           ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 07/16] virtio-blk: drop config_mutex Michael S. Tsirkin
2014-10-06 11:48   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 08/16] virtio_net: drop config_enable Michael S. Tsirkin
2014-10-06 11:50   ` Cornelia Huck
2014-10-06 12:10     ` Michael S. Tsirkin
2014-10-06 19:02   ` David Miller
2014-10-07  6:49     ` Michael S. Tsirkin
2014-10-07 15:36       ` David Miller
2014-10-07 15:42         ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 09/16] virtio-net: drop config_mutex Michael S. Tsirkin
2014-10-06 11:46   ` Sergei Shtylyov
2014-10-06 11:56     ` Michael S. Tsirkin
2014-10-06 12:07       ` Sergei Shtylyov
2014-10-06 12:22         ` Michael S. Tsirkin
2014-10-06 12:31           ` Sergei Shtylyov
2014-10-06 11:56   ` Cornelia Huck
2014-10-06 12:01     ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 10/16] virtio: add API to enable VQs early Michael S. Tsirkin
2014-10-06 14:08   ` Cornelia Huck
2014-10-06 14:51     ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 11/16] virtio_net: minor cleanup Michael S. Tsirkin
2014-10-06 12:06   ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 12/16] virtio_net: enable VQs early Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 13/16] virtio_blk: " Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 14/16] virtio_console: " Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 15/16] 9p/trans_virtio: " Michael S. Tsirkin
2014-10-05 16:07 ` Michael S. Tsirkin [this message]
2014-10-06 14:17   ` [PATCH 16/16] virtio_net: fix use after free on allocation failure Cornelia Huck

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