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

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The 'res->iov' will be leaked if the guest trigger following sequences:

	virgl_cmd_create_resource_2d
	virgl_resource_attach_backing
	virgl_cmd_resource_unref

This patch fixes this.

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"

Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-6-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Li Qiang 2021-05-15 20:04:00 -07:00 committed by Gerd Hoffmann
parent b7afebcf9e
commit f6091d86ba
1 changed files with 7 additions and 0 deletions
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7
contrib/vhost-user-gpu/virgl.c
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@ -108,9 +108,16 @@ virgl_cmd_resource_unref(VuGpu *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_resource_unref unref;
struct iovec *res_iovs = NULL;
int num_iovs = 0;
VUGPU_FILL_CMD(unref);
virgl_renderer_resource_detach_iov(unref.resource_id,
&res_iovs,
&num_iovs);
g_free(res_iovs);
virgl_renderer_resource_unref(unref.resource_id);
}