staging: rtl8712: fix potential memory leak

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.
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Signed-off-by: Nam Cao <namcaov@gmail.com>
Link: https://lore.kernel.org/r/0a3414b12031f6cdcba81a8725e91eb9567ff34f.1666688642.git.namcaov@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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;
 }