[PATCH v2 4/4] staging: rtl8712: fix potential memory leak

[Nam Cao]

In r8712_init_drv_sw(), whenever any function call returns error, it is
returned immediately without properly cleaning up the other successfully
executed functions. This can cause memory leak.

Instead of return immediately, free all the allocated buffers first.

Signed-off-by: Nam Cao <namcaov@xxxxxxxxx>
---
 drivers/staging/rtl8712/os_intfs.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
index 205b7d66a40a..a2f3645be0cc 100644
--- a/drivers/staging/rtl8712/os_intfs.c
+++ b/drivers/staging/rtl8712/os_intfs.c
@@ -304,29 +304,42 @@ int r8712_init_drv_sw(struct _adapter *padapter)
 	padapter->cmdpriv.padapter = padapter;
 	ret = r8712_init_evt_priv(&padapter->evtpriv);
 	if (ret)
-		return ret;
+		goto free_cmd;
 	ret = r8712_init_mlme_priv(padapter);
 	if (ret)
-		return ret;
+		goto free_evt;
 	ret = _r8712_init_xmit_priv(&padapter->xmitpriv, padapter);
 	if (ret)
-		return ret;
+		goto free_mlme;
 	ret = _r8712_init_recv_priv(&padapter->recvpriv, padapter);
 	if (ret)
-		return ret;
+		goto free_xmit;
 	memset((unsigned char *)&padapter->securitypriv, 0,
 	       sizeof(struct security_priv));
 	timer_setup(&padapter->securitypriv.tkip_timer,
 		    r8712_use_tkipkey_handler, 0);
 	ret = _r8712_init_sta_priv(&padapter->stapriv);
 	if (ret)
-		return ret;
+		goto free_recv;
 	padapter->stapriv.padapter = padapter;
 	r8712_init_bcmc_stainfo(padapter);
 	r8712_init_pwrctrl_priv(padapter);
 	mp871xinit(padapter);
 	init_default_value(padapter);
 	r8712_InitSwLeds(padapter);
+
+	return 0;
+
+free_recv:
+	_r8712_free_recv_priv(&padapter->recvpriv);
+free_xmit:
+	_free_xmit_priv(&padapter->xmitpriv);
+free_mlme:
+	r8712_free_mlme_priv(&padapter->mlmepriv);
+free_evt:
+	r8712_free_evt_priv(&padapter->evtpriv);
+free_cmd:
+	r8712_free_cmd_priv(&padapter->cmdpriv);
 	return ret;
 }
 
-- 
2.25.1