linux-kernel - [PATCH] usb: gadget: udc: gr_udc: fix memleak on error handling path in gr_ep

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Message-Id: <20200626131747.18276-1-novikov@ispras.ru>
Date:   Fri, 26 Jun 2020 16:17:47 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Evgeny Novikov <novikov@...ras.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Jason Yan <yanaijie@...wei.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, ldv-project@...uxtesting.org
Subject: [PATCH] usb: gadget: udc: gr_udc: fix memleak on error handling path in gr_ep_init()

gr_ep_init() does not assign the allocated request anywhere if allocation
of memory for the buffer fails. This is a memory leak fixed by the given
patch.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
---
 drivers/usb/gadget/udc/gr_udc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/gr_udc.c b/drivers/usb/gadget/udc/gr_udc.c
index 7164ad9800f1..7419889ebe9a 100644
--- a/drivers/usb/gadget/udc/gr_udc.c
+++ b/drivers/usb/gadget/udc/gr_udc.c
@@ -1980,9 +1980,12 @@ static int gr_ep_init(struct gr_udc *dev, int num, int is_in, u32 maxplimit)
 
 	if (num == 0) {
 		_req = gr_alloc_request(&ep->ep, GFP_ATOMIC);
+		if (!_req)
+			return -ENOMEM;
+
 		buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_ATOMIC);
-		if (!_req || !buf) {
-			/* possible _req freed by gr_probe via gr_remove */
+		if (!buf) {
+			gr_free_request(&ep->ep, _req);
 			return -ENOMEM;
 		}
 
-- 
2.16.4