linux-kernel - [PATCH] usb: gadget: fix potential double-free in m66592

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Date:   Fri, 22 May 2020 23:06:25 -0500
From:   wu000273@....edu
To:     balbi@...nel.org
Cc:     gregkh@...uxfoundation.org, clabbe@...libre.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        kjlu@....edu, wu000273@....edu
Subject: [PATCH] usb: gadget: fix potential double-free in m66592_probe.

From: Qiushi Wu <wu000273@....edu>

m66592_free_request() is called under label "err_add_udc"
and "clean_up", and m66592->ep0_req is not set to NULL after
first free, leading to a double-free. Fix this issue by
setting m66592->ep0_req to NULL after the first free.

Fixes: 0f91349b89f3 ("usb: gadget: convert all users to the new udc infrastructure")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/usb/gadget/udc/m66592-udc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/m66592-udc.c b/drivers/usb/gadget/udc/m66592-udc.c
index 75d16a8902e6..931e6362a13d 100644
--- a/drivers/usb/gadget/udc/m66592-udc.c
+++ b/drivers/usb/gadget/udc/m66592-udc.c
@@ -1667,7 +1667,7 @@ static int m66592_probe(struct platform_device *pdev)
 
 err_add_udc:
 	m66592_free_request(&m66592->ep[0].ep, m66592->ep0_req);
-
+	m66592->ep0_req = NULL;
 clean_up3:
 	if (m66592->pdata->on_chip) {
 		clk_disable(m66592->clk);
-- 
2.17.1