[66/98] p54pci: rx frame length check

[Greg KH]

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>

commit f5300e04df78feae8107c1846dd3a9e27c071b2f upstream.

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@xxxxxxxxx>
Signed-off-by: Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/wireless/p54/p54pci.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/net/wireless/p54/p54pci.c
+++ b/drivers/net/wireless/p54/p54pci.c
@@ -205,6 +205,14 @@ static void p54p_check_rx_ring(struct ie
 			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)) {


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