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

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[ Upstream commit 7d602f30149a117eea260208b1661bc404c21dfd ]

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().

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Faqiang Zhu <faqiang.zhu@nxp.com>
Link: https://lore.kernel.org/r/20220608190430.2814358-1-Frank.Li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Frank Li 2022-06-08 14:04:30 -05:00 committed by Greg Kroah-Hartman
parent e7170b5a28
commit e65d9b7147
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/cdns3/gadget.c
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@ -549,9 +549,9 @@ static void cdns3_wa2_remove_old_request(struct cdns3_endpoint *priv_ep)
trace_cdns3_wa2(priv_ep, "removes eldest request"); trace_cdns3_wa2(priv_ep, "removes eldest request");
kfree(priv_req->request.buf); kfree(priv_req->request.buf);
list_del_init(&priv_req->list);
cdns3_gadget_ep_free_request(&priv_ep->endpoint, cdns3_gadget_ep_free_request(&priv_ep->endpoint,
&priv_req->request); &priv_req->request);
list_del_init(&priv_req->list);
--priv_ep->wa2_counter; --priv_ep->wa2_counter;
if (!chain) if (!chain)