CVE-2022-50034 — usb: cdns3 fix use-after-free at workaround 2

Affected: Linux

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().

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CVE-2022-50034 — usb: cdns3 fix use-after-free at workaround 2