[PATCH AUTOSEL 5.17 02/60] staging: rtl8712: fix a potential memory leak in r871xu_drv_init()

Sasha Levin
2022-06-07T18:52:58Z

From: Xiaoke Wang <xkernel.wang@foxmail.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@oracle.com>
Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
Link: https://lore.kernel.org/r/tencent_B8048C592777830380A23A7C4409F9DF1305@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.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 d15d52c0d1a7..003e97205124 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 ee4c61f85a07..56450ede9f23 100644
--- a/drivers/staging/rtl8712/usb_intf.c
+++ b/drivers/staging/rtl8712/usb_intf.c
@@ -265,6 +265,7 @@ 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)
@@ -302,9 +303,6 @@ void r871x_dev_unload(struct _adapter *padapter)
rtl8712_hal_deinit(padapter);
}

- /*s6.*/
- if (padapter->dvobj_deinit)
- padapter->dvobj_deinit(padapter);
padapter->bup = false;
}
}
@@ -607,6 +605,8 @@ 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