40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
From df98392ee2334462e9f1007b3c9f7a14938bd9ab 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 2/2] 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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---
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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 e887589a30..d33da9b7ef 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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@@ -1883,6 +1883,7 @@ 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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