From: Pan Bian <bianpan2016@163.com>
To: Herton Ronaldo Krzesinski <herton@canonical.com>,
Hin-Tak Leung <htl10@users.sourceforge.net>,
Larry Finger <Larry.Finger@lwfinger.net>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Pan Bian <bianpan2016@163.com>
Subject: [PATCH] rtl818x: fix potential use after free
Date: Thu, 29 Nov 2018 18:48:10 +0800 [thread overview]
Message-ID: <1543488490-101743-1-git-send-email-bianpan2016@163.com> (raw)
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 <bianpan2016@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
next reply other threads:[~2018-11-29 10:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-29 10:48 Pan Bian [this message]
2018-11-29 15:09 ` [PATCH] rtl818x: fix potential use after free Larry Finger
2018-12-13 15:03 ` Kalle Valo
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