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vhost-user-gpu: fix memory leak in vg_resource_attach_backing (CVE-2021-3544)

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Check whether the 'res' has already been attach_backing to avoid
memory leak.

Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 204f01b309 ("virtio-gpu: fix memory leak
in resource attach backing")

Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-4-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Li Qiang 2021-05-15 20:03:58 -07:00 committed by Gerd Hoffmann
parent 86dd8fac2a
commit b9f79858a6
1 changed files with 5 additions and 0 deletions
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5
contrib/vhost-user-gpu/vhost-user-gpu.c
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@ -489,6 +489,11 @@ vg_resource_attach_backing(VuGpu *g,
return; return;
} }
if (res->iov) {
cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
return;
}
ret = vg_create_mapping_iov(g, &ab, cmd, &res->iov); ret = vg_create_mapping_iov(g, &ab, cmd, &res->iov);
if (ret != 0) { if (ret != 0) {
cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC; cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;