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rtl818x: fix potential use after free

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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>
ACKed-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Pan Bian 2018-11-29 18:48:10 +08:00 • committed by Kalle Valo
commit afbb1947db
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
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@ -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;