linux-kernel - [PATCH v2] staging: r8188eu: handle rtw_init_netdev

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Date:   Sun, 23 Jan 2022 23:47:35 +0530
From:   Vihas Mak <makvihas@...il.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Straube <straube.linux@...il.com>,
        Martin Kaiser <martin@...ser.cx>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Vihas Mak <makvihas@...il.com>
Subject: [PATCH v2] staging: r8188eu: handle rtw_init_netdev_name() failure appropriately

rtw_init_netdev_name() calls dev_alloc_name() which allocates the name
for the device as per the given name format.
The name format is specified by the module parameter "ifname".
It returns a negative err code if the format is invalid. Handle this
error appropriately.
Cancel the timers ininitliazed by rtw_init_drv_sw() before calling
rtw_free_drv_sw() and then proceed to free the adapter.

Also, if register_netdev() fails then goto free_drv_sw instead of
goto handle_dualmac.

Signed-off-by: Vihas Mak <makvihas@...il.com>
---
v1->v2:
    free the adapter and netdev instead of warning the user about 
    allocation failure.

 drivers/staging/r8188eu/os_dep/usb_intf.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/r8188eu/os_dep/usb_intf.c b/drivers/staging/r8188eu/os_dep/usb_intf.c
index 91792dfd3..85b5d0bd7 100644
--- a/drivers/staging/r8188eu/os_dep/usb_intf.c
+++ b/drivers/staging/r8188eu/os_dep/usb_intf.c
@@ -399,7 +399,11 @@ static struct adapter *rtw_usb_if1_init(struct dvobj_priv *dvobj,
 			DBG_88E("can't get autopm:\n");
 
 	/*  alloc dev name after read efuse. */
-	rtw_init_netdev_name(pnetdev, padapter->registrypriv.ifname);
+	if (rtw_init_netdev_name(pnetdev, padapter->registrypriv.ifname) < 0) {
+		DBG_88E("rtw_init_netdev_name failed, ifname:%s\n",
+			padapter->registrypriv.ifname);
+		goto free_drv_sw;
+	}
 	rtw_macaddr_cfg(padapter->eeprompriv.mac_addr);
 	rtw_init_wifidirect_addrs(padapter, padapter->eeprompriv.mac_addr,
 				  padapter->eeprompriv.mac_addr);
@@ -409,7 +413,7 @@ static struct adapter *rtw_usb_if1_init(struct dvobj_priv *dvobj,
 
 	/* step 6. Tell the network stack we exist */
 	if (register_netdev(pnetdev) != 0)
-		goto handle_dualmac;
+		goto free_drv_sw;
 
 	DBG_88E("bDriverStopped:%d, bSurpriseRemoved:%d, bup:%d, hw_init_completed:%d\n"
 		, padapter->bDriverStopped
@@ -420,6 +424,11 @@ static struct adapter *rtw_usb_if1_init(struct dvobj_priv *dvobj,
 
 	status = _SUCCESS;
 
+free_drv_sw:
+	if (status != _SUCCESS) {
+		rtw_cancel_all_timer(padapter);
+		rtw_free_drv_sw(padapter);
+	}
 handle_dualmac:
 	if (status != _SUCCESS)
 		rtw_handle_dualmac(padapter, 0);
-- 
2.30.2