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vhost-user-gpu: fix memory leak while calling 'vg_resource_unref' (CVE-2021-3544) 

If the guest trigger following sequences, the attach_backing will be leaked:

	vg_resource_create_2d
	vg_resource_attach_backing
	vg_resource_unref

This patch fix this by freeing 'res->iov' in vg_resource_destroy.

Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 5e8e3c4c75 ("virtio-gpu: fix resource leak
in virgl_cmd_resource_unref")

Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-5-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Li Qiang 2021-05-15 20:03:59 -07:00 committed by Gerd Hoffmann
parent b9f79858a6
commit b7afebcf9e
1 changed files with 1 additions and 0 deletions
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contrib/vhost-user-gpu/vhost-user-gpu.c
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@ -400,6 +400,7 @@ vg_resource_destroy(VuGpu *g,
}
vugbm_buffer_destroy(&res->buffer);
g_free(res->iov);
pixman_image_unref(res->image);
QTAILQ_REMOVE(&g->reslist, res, next);
g_free(res);