This is a note to let you know that I've just added the patch titled
xen-netfront: use correct linear area after linearizing an skb
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-netfront-use-correct-linear-area-after-linearizing-an-skb.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Dec 14 08:37:47 PST 2014
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Tue, 9 Dec 2014 18:43:28 +0000
Subject: xen-netfront: use correct linear area after linearizing an skb
From: David Vrabel <david.vrabel@xxxxxxxxxx>
[ Upstream commit 11d3d2a16cc1f05c6ece69a4392e99efb85666a6 ]
Commit 97a6d1bb2b658ac85ed88205ccd1ab809899884d (xen-netfront: Fix
handling packets on compound pages with skb_linearize) attempted to
fix a problem where an skb that would have required too many slots
would be dropped causing TCP connections to stall.
However, it filled in the first slot using the original buffer and not
the new one and would use the wrong offset and grant access to the
wrong page.
Netback would notice the malformed request and stop all traffic on the
VIF, reporting:
vif vif-3-0 vif3.0: txreq.offset: 85e, size: 4002, end: 6144
vif vif-3-0 vif3.0: fatal error; disabling device
Reported-by: Anthony Wright <anthony@xxxxxxxxxxxxxxx>
Tested-by: Anthony Wright <anthony@xxxxxxxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/xen-netfront.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -627,6 +627,9 @@ static int xennet_start_xmit(struct sk_b
slots, skb->len);
if (skb_linearize(skb))
goto drop;
+ data = skb->data;
+ offset = offset_in_page(data);
+ len = skb_headlen(skb);
}
spin_lock_irqsave(&queue->tx_lock, flags);
Patches currently in stable-queue which might be from david.vrabel@xxxxxxxxxx are
queue-3.18/xen-netfront-use-correct-linear-area-after-linearizing-an-skb.patch
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