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Date: Sun, 14 Dec 2014 12:21:20 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Anthony Wright <anthony@...rnetdata.com>, David Vrabel <david.vrabel@...rix.com>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 3.18 09/19] xen-netfront: use correct linear area after linearizing an skb 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Vrabel <david.vrabel@...rix.com> [ 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@...rnetdata.com> Tested-by: Anthony Wright <anthony@...rnetdata.com> Signed-off-by: David Vrabel <david.vrabel@...rix.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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