qemu-kvm/kvm-virtio-net-fix-map-leaking-on-error-during-receive.patch

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From 10b3a7b56dc9b4c88e503c36c1b13d80bcb7b066 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Tue, 8 Mar 2022 10:42:51 +0800
Subject: [PATCH 2/6] virtio-net: fix map leaking on error during receive
RH-Author: Jon Maloy <jmaloy@redhat.com>
RH-MergeRequest: 154: virtio-net: fix map leaking on error during receive
RH-Commit: [1/1] 7178b0cd5ce7c89fe476f2e199c9212c8b89327a (jmaloy/qemu-kvm)
RH-Bugzilla: 2063206
RH-Acked-by: Jason Wang <None>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2063206
Upstream: Merged
CVE: CVE-2022-26353
commit abe300d9d894f7138e1af7c8e9c88c04bfe98b37
Author: Jason Wang <jasowang@redhat.com>
Date: Tue Mar 8 10:42:51 2022 +0800
virtio-net: fix map leaking on error during receive
Commit bedd7e93d0196 ("virtio-net: fix use after unmap/free for sg")
tries to fix the use after free of the sg by caching the virtqueue
elements in an array and unmap them at once after receiving the
packets, But it forgot to unmap the cached elements on error which
will lead to leaking of mapping and other unexpected results.
Fixing this by detaching the cached elements on error. This addresses
CVE-2022-26353.
Reported-by: Victor Tom <vv474172261@gmail.com>
Cc: qemu-stable@nongnu.org
Fixes: CVE-2022-26353
Fixes: bedd7e93d0196 ("virtio-net: fix use after unmap/free for sg")
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
(cherry picked from commit abe300d9d894f7138e1af7c8e9c88c04bfe98b37)
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
---
hw/net/virtio-net.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index f2014d5ea0..e1f4748831 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1862,6 +1862,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
err:
for (j = 0; j < i; j++) {
+ virtqueue_detach_element(q->rx_vq, elems[j], lens[j]);
g_free(elems[j]);
}
--
2.27.0