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Change History

In the Linux kernel, the following vulnerability has been resolved:

usb: cdns3 fix use-after-free at workaround 2

BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xac

cdns3_wa2_remove_old_request()
{
	...
	kfree(priv_req->request.buf);
	cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request);
	list_del_init(&priv_req->list);
	^^^ use after free
	...
}

cdns3_gadget_ep_free_request() free the space pointed by priv_req,
but priv_req is used in the following list_del_init().

This patch move list_del_init() before cdns3_gadget_ep_free_request().

https://git.kernel.org/stable/c/6d7ac60098b206d0472475b666cb09d556bec03d

https://git.kernel.org/stable/c/6fd50446e7c9a98b4bcf96815f5c9602a16ea472

https://git.kernel.org/stable/c/7d602f30149a117eea260208b1661bc404c21dfd

https://git.kernel.org/stable/c/c3c1dbad3a2db32ecf371c97f2058491b8ba0f9a

https://git.kernel.org/stable/c/e65d9b7147d7be3504893ca7dfb85286bda83d40