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| author | Christian Lamparter <chunkeey@googlemail.com> | 2010-01-18 00:07:38 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-01-18 15:07:02 -0500 |
| commit | f5300e04df78feae8107c1846dd3a9e27c071b2f (patch) | |
| tree | 82cb7d53d5c91b120c76daa82b334ee090ce4c36 | |
| parent | e850f68b8f27a76c4377c34f2e216b8e7e10db3d (diff) | |
| download | linux-3.10-f5300e04df78feae8107c1846dd3a9e27c071b2f.tar.gz linux-3.10-f5300e04df78feae8107c1846dd3a9e27c071b2f.tar.bz2 linux-3.10-f5300e04df78feae8107c1846dd3a9e27c071b2f.zip | |
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>
| -rw-r--r-- | drivers/net/wireless/p54/p54pci.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/wireless/p54/p54pci.c b/drivers/net/wireless/p54/p54pci.c index a15962a19b2..a72f7c2577d 100644 --- a/drivers/net/wireless/p54/p54pci.c +++ b/drivers/net/wireless/p54/p54pci.c @@ -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)) { |