Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Message-ID: <tencent_A887200ACC0AB9B11C761479E1E84A22FF08@qq.com>
From:   xkernel.wang@foxmail.com
To:     gregkh@linuxfoundation.org
Cc:     Larry.Finger@lwfinger.net, florian.c.schilhabel@googlemail.com,
        linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
        Xiaoke Wang <xkernel.wang@foxmail.com>
Subject: [PATCH v2] staging: rtl8712: fix potential memory leak in r8712_xmit_resource_alloc()
Date:   Wed,  6 Apr 2022 11:52:52 +0800
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Xiaoke Wang <xkernel.wang@foxmail.com>

In r8712_xmit_resource_alloc(), if usb_alloc_urb() fails, there can be 
some explored items are not released before this function returns.

Therefore, this patch re-explores the allocated items and uses 
usb_free_urb() to release them.

Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
---
ChangeLog:
v1->v2 remove kmemleak_not_leak() and update the description.
 drivers/staging/rtl8712/xmit_linux.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8712/xmit_linux.c b/drivers/staging/rtl8712/xmit_linux.c
index 4a93839..034de02 100644
--- a/drivers/staging/rtl8712/xmit_linux.c
+++ b/drivers/staging/rtl8712/xmit_linux.c
@@ -113,9 +113,10 @@ int r8712_xmit_resource_alloc(struct _adapter *padapter,
 		pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
 		if (!pxmitbuf->pxmit_urb[i]) {
 			netdev_err(padapter->pnetdev, "pxmitbuf->pxmit_urb[i] == NULL\n");
+			while (i-- > 0)
+				usb_free_urb(pxmitbuf->pxmit_urb[i]);
 			return -ENOMEM;
 		}
-		kmemleak_not_leak(pxmitbuf->pxmit_urb[i]);
 	}
 	return 0;
 }
--