linux-kernel - [PATCH v2] usb: gadget: r8a66597-udc: Fix double free in r8a66597

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Message-Id: <20240923202019.37875-1-m.arhipov@rosa.ru>
Date: Mon, 23 Sep 2024 23:20:19 +0300
From: Mikhail Arkhipov <m.arhipov@...a.ru>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Mikhail Arkhipov <m.arhipov@...a.ru>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Felipe Balbi <balbi@...com>,
	Mike Frysinger <vapier@...too.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH v2] usb: gadget: r8a66597-udc: Fix double free in r8a66597_probe

The function r8a66597_free_request is already called in the err_add_udc
block, and freeing r8a66597->ep0_req twice may lead to a double free error.

If the probe process fails and the r8a66597_probe function subsequently
goes through its error handling path. Since r8a66597_free_request is called
multiple times in different error handling sections, it leads to an attempt
to free the same memory twice.

Remove the redundant call to r8a66597_free_request in the clean_up2 block.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 0f91349b89f3 ("usb: gadget: convert all users to the new udc infrastructure")
Signed-off-by: Mikhail Arkhipov <m.arhipov@...a.ru>
---
v2: Remove redundant call to r8a66597_free_request in clean_up2 block 
instead of assigning r8a66597->ep0_req to NULL, as suggested by 
Sebastian Andrzej Siewior <bigeasy@...utronix.de>.
 drivers/usb/gadget/udc/r8a66597-udc.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/usb/gadget/udc/r8a66597-udc.c b/drivers/usb/gadget/udc/r8a66597-udc.c
index db4a10a979f9..a9b82f371abb 100644
--- a/drivers/usb/gadget/udc/r8a66597-udc.c
+++ b/drivers/usb/gadget/udc/r8a66597-udc.c
@@ -1956,9 +1956,6 @@ static int r8a66597_probe(struct platform_device *pdev)
 	if (r8a66597->pdata->on_chip)
 		clk_disable_unprepare(r8a66597->clk);
 
-	if (r8a66597->ep0_req)
-		r8a66597_free_request(&r8a66597->ep[0].ep, r8a66597->ep0_req);
-
 	return ret;
 }
 
-- 
2.39.3 (Apple Git-146)