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| author | Johannes Berg <johannes@sipsolutions.net> | 2008-05-08 01:43:59 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-05-12 21:22:19 -0400 |
| commit | dbabad0c9c026dea3ba803cbd9d768cdffc68e32 (patch) | |
| tree | 046b607c669724ab4bde3108eab4c79f467eb21d /drivers/net/wireless/zd1211rw | |
| parent | 6d6936e2ea82ebcbdd12d489b7b5ccf430de52f1 (diff) | |
| download | linux-dbabad0c9c026dea3ba803cbd9d768cdffc68e32.tar.gz linux-dbabad0c9c026dea3ba803cbd9d768cdffc68e32.tar.bz2 linux-dbabad0c9c026dea3ba803cbd9d768cdffc68e32.zip | |
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: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/zd1211rw')
| -rw-r--r-- | drivers/net/wireless/zd1211rw/zd_usb.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c index 5316074f39f0..12e24f04dddf 100644 --- a/drivers/net/wireless/zd1211rw/zd_usb.c +++ b/drivers/net/wireless/zd1211rw/zd_usb.c @@ -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; |