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From ba9806fd38f113deb452156fdc644407f061311c Mon Sep 17 00:00:00 2001
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From: Jason Wang <jasowang@redhat.com>
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Date: Tue, 8 Mar 2022 10:42:51 +0800
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Subject: [PATCH 06/11] virtio-net: fix map leaking on error during receive
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 165: virtio-net: fix map leaking on error during receive
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RH-Commit: [1/1] f0546c74a5bfd37de473703f6a7c6f8f29fb0831 (jmaloy/qemu-kvm)
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RH-Bugzilla: 2075637
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RH-Acked-by: Mauro Matteo Cascella <None>
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2075637
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Upstream: Merged
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CVE: CVE-2022-26353
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commit abe300d9d894f7138e1af7c8e9c88c04bfe98b37
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Author: Jason Wang <jasowang@redhat.com>
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Date: Tue Mar 8 10:42:51 2022 +0800
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virtio-net: fix map leaking on error during receive
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Commit bedd7e93d0196 ("virtio-net: fix use after unmap/free for sg")
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tries to fix the use after free of the sg by caching the virtqueue
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elements in an array and unmap them at once after receiving the
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packets, But it forgot to unmap the cached elements on error which
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will lead to leaking of mapping and other unexpected results.
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Fixing this by detaching the cached elements on error. This addresses
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CVE-2022-26353.
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Reported-by: Victor Tom <vv474172261@gmail.com>
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Cc: qemu-stable@nongnu.org
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Fixes: CVE-2022-26353
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Fixes: bedd7e93d0196 ("virtio-net: fix use after unmap/free for sg")
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit abe300d9d894f7138e1af7c8e9c88c04bfe98b37)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/net/virtio-net.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
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index f2014d5ea0..e1f4748831 100644
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--- a/hw/net/virtio-net.c
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+++ b/hw/net/virtio-net.c
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@@ -1862,6 +1862,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
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err:
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for (j = 0; j < i; j++) {
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+ virtqueue_detach_element(q->rx_vq, elems[j], lens[j]);
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g_free(elems[j]);
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}
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--
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2.27.0
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