[PATCH] rtl818x: fix potential use after free

[Pan Bian]

entry is released via usb_put_urb just after calling usb_submit_urb.
However, entry is used if the submission fails, resulting in a use after
free bug. The patch fixes this.

Signed-off-by: Pan Bian <bianpan2...@163.com>
---
 drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c 
b/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
index cec3778..1a2ea8b 100644
--- a/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
+++ b/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
@@ -444,12 +444,13 @@ static int rtl8187_init_urbs(struct ieee80211_hw *dev)
                skb_queue_tail(&priv->rx_queue, skb);
                usb_anchor_urb(entry, &priv->anchored);
                ret = usb_submit_urb(entry, GFP_KERNEL);
-               usb_put_urb(entry);
                if (ret) {
                        skb_unlink(skb, &priv->rx_queue);
                        usb_unanchor_urb(entry);
+                       usb_put_urb(entry);
                        goto err;
                }
+               usb_put_urb(entry);
        }
        return ret;
 
-- 
2.7.4