linux-kernel - [PATCH v2] staging: rtl8712: fix potential memory leak in r8712_xmit_resource

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Date:   Wed,  6 Apr 2022 11:52:52 +0800
From:   xkernel.wang@...mail.com
To:     gregkh@...uxfoundation.org
Cc:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH v2] staging: rtl8712: fix potential memory leak in r8712_xmit_resource_alloc()

From: Xiaoke Wang <xkernel.wang@...mail.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@...mail.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;
 }
--