linux-kernel - [PATCH AUTOSEL 5.10 02/38] staging: rtl8712: fix a potential memory leak in r871xu_drv

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Date:   Tue,  7 Jun 2022 13:57:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xiaoke Wang <xkernel.wang@...mail.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, Larry.Finger@...inger.net,
        florian.c.schilhabel@...glemail.com, kuba@...nel.org,
        len.baker@....com, paskripkin@...il.com, wanngchenng@...il.com,
        skumark1902@...il.com, linux-staging@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.10 02/38] staging: rtl8712: fix a potential memory leak in r871xu_drv_init()

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

[ Upstream commit 7288ff561de650d4139fab80e9cb0da9b5b32434 ]

In r871xu_drv_init(), if r8712_init_drv_sw() fails, then the memory
allocated by r8712_alloc_io_queue() in r8712_usb_dvobj_init() is not
properly released as there is no action will be performed by
r8712_usb_dvobj_deinit().
To properly release it, we should call r8712_free_io_queue() in
r8712_usb_dvobj_deinit().

Besides, in r871xu_dev_remove(), r8712_usb_dvobj_deinit() will be called
by r871x_dev_unload() under condition `padapter->bup` and
r8712_free_io_queue() is called by r8712_free_drv_sw().
However, r8712_usb_dvobj_deinit() does not rely on `padapter->bup` and
calling r8712_free_io_queue() in r8712_free_drv_sw() is negative for
better understading the code.
So I move r8712_usb_dvobj_deinit() into r871xu_dev_remove(), and remove
r8712_free_io_queue() from r8712_free_drv_sw().

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
Link: https://lore.kernel.org/r/tencent_B8048C592777830380A23A7C4409F9DF1305@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/rtl8712/os_intfs.c | 1 -
 drivers/staging/rtl8712/usb_intf.c | 6 +++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
index 2214aca09730..daa3180dfde3 100644
--- a/drivers/staging/rtl8712/os_intfs.c
+++ b/drivers/staging/rtl8712/os_intfs.c
@@ -332,7 +332,6 @@ void r8712_free_drv_sw(struct _adapter *padapter)
 	r8712_free_evt_priv(&padapter->evtpriv);
 	r8712_DeInitSwLeds(padapter);
 	r8712_free_mlme_priv(&padapter->mlmepriv);
-	r8712_free_io_queue(padapter);
 	_free_xmit_priv(&padapter->xmitpriv);
 	_r8712_free_sta_priv(&padapter->stapriv);
 	_r8712_free_recv_priv(&padapter->recvpriv);
diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
index fed96d4251bf..77f090bdd36e 100644
--- a/drivers/staging/rtl8712/usb_intf.c
+++ b/drivers/staging/rtl8712/usb_intf.c
@@ -266,6 +266,7 @@ static uint r8712_usb_dvobj_init(struct _adapter *padapter)
 
 static void r8712_usb_dvobj_deinit(struct _adapter *padapter)
 {
+	r8712_free_io_queue(padapter);
 }
 
 void rtl871x_intf_stop(struct _adapter *padapter)
@@ -303,9 +304,6 @@ void r871x_dev_unload(struct _adapter *padapter)
 			rtl8712_hal_deinit(padapter);
 		}
 
-		/*s6.*/
-		if (padapter->dvobj_deinit)
-			padapter->dvobj_deinit(padapter);
 		padapter->bup = false;
 	}
 }
@@ -610,6 +608,8 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)
 	/* Stop driver mlme relation timer */
 	r8712_stop_drv_timers(padapter);
 	r871x_dev_unload(padapter);
+	if (padapter->dvobj_deinit)
+		padapter->dvobj_deinit(padapter);
 	r8712_free_drv_sw(padapter);
 	free_netdev(pnetdev);
 
-- 
2.35.1