Commit dbabad0c authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

zd1211rw: fix potential use-after-free bug



zd_mac_tx_to_dev() could potentially free the skb, or hand it off
to mac80211 which might free it. Hence, this code needs to get the
usb pointer out of skb->cb before handing it off to that function.
Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 6d6936e2
......@@ -889,9 +889,13 @@ static void tx_urb_complete(struct urb *urb)
}
free_urb:
skb = (struct sk_buff *)urb->context;
zd_mac_tx_to_dev(skb, urb->status);
/*
* grab 'usb' pointer before handing off the skb (since
* it might be freed by zd_mac_tx_to_dev or mac80211)
*/
cb = (struct zd_tx_skb_control_block *)skb->cb;
usb = &zd_hw_mac(cb->hw)->chip.usb;
zd_mac_tx_to_dev(skb, urb->status);
free_tx_urb(usb, urb);
tx_dec_submitted_urbs(usb);
return;
......
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