CVE: CVE-2021-3544
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Upstream-Status: Backport
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Signed-off-by: Ross Burton <ross.burton@arm.com>
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From b9f79858a614d95f5de875d0ca31096eaab72c3b Mon Sep 17 00:00:00 2001
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From: Li Qiang <liq3ea@163.com>
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Date: Sat, 15 May 2021 20:03:58 -0700
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Subject: [PATCH 3/7] vhost-user-gpu: fix memory leak in
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vg_resource_attach_backing (CVE-2021-3544)
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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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Check whether the 'res' has already been attach_backing to avoid
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memory leak.
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Fixes: CVE-2021-3544
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Reported-by: Li Qiang <liq3ea@163.com>
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virtio-gpu fix: 204f01b309 ("virtio-gpu: fix memory leak
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in resource attach backing")
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Signed-off-by: Li Qiang <liq3ea@163.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-Id: <20210516030403.107723-4-liq3ea@163.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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---
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contrib/vhost-user-gpu/vhost-user-gpu.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/contrib/vhost-user-gpu/vhost-user-gpu.c b/contrib/vhost-user-gpu/vhost-user-gpu.c
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index b5e153d0d6..0437e52b64 100644
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--- a/contrib/vhost-user-gpu/vhost-user-gpu.c
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+++ b/contrib/vhost-user-gpu/vhost-user-gpu.c
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@@ -489,6 +489,11 @@ vg_resource_attach_backing(VuGpu *g,
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return;
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}
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+ if (res->iov) {
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+ cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
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+ return;
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+ }
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+
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ret = vg_create_mapping_iov(g, &ab, cmd, &res->iov);
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if (ret != 0) {
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cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
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--
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2.25.1
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