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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Evgeny Novikov <novikov@ispras.ru>,
        Felipe Balbi <balbi@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 55/86] usb: gadget: udc: gr_udc: fix memleak on error handling path in gr_ep_init()
Date:   Mon, 27 Jul 2020 16:04:29 +0200
Message-Id: <20200727134917.173467637@linuxfoundation.org>
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From: Evgeny Novikov <novikov@ispras.ru>

[ Upstream commit c8f8529e2c4141afa2ebb487ad48e8a6ec3e8c99 ]

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@ispras.ru>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 e50108f9a374e..e0b2fb33ed0d8 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;
 		}
 
-- 
2.25.1