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p54pci: rx frame length check 

A long time ago, a user reported several crashes due to
data corruptions which are likely the result of a
not-100%-supported, or faulty? PCI bridge.
( http://patchwork.kernel.org/patch/53004/ )

This patch fixes entry #1.
"1.  p54p_check_rx_ring - skb_over_panic: Under a ping flood
or just left running for a bit would panic with a skb_over_panic."
As described in the mail: The invalid frame length causes
skb_put to bailout and trigger a crash.

Note:
Simply dropping the frame is problematic, because if its content
contains a tx feedback we would lose some portion of the device
memory space.... And the driver/mac80211 should handle all other
invalid data.

Reported-by: Quintin Pitts <geek4linux@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2010-01-18 00:07:38 +01:00 committed by John W. Linville
parent e850f68b8f
commit f5300e04df
1 changed files with 8 additions and 0 deletions
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8
drivers/net/wireless/p54/p54pci.c
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@ -197,6 +197,14 @@ static void p54p_check_rx_ring(struct ieee80211_hw *dev, u32 *index,
i %= ring_limit;
continue;
}
if (unlikely(len > priv->common.rx_mtu)) {
if (net_ratelimit())
dev_err(&priv->pdev->dev, "rx'd frame size "
"exceeds length threshold.\n");
len = priv->common.rx_mtu;
}
skb_put(skb, len);
if (p54_rx(dev, skb)) {