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Message-Id: <20130402224717.396397038@linuxfoundation.org>
Date: Tue, 2 Apr 2013 15:50:15 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, David Oostdyk <daveo@...mit.edu>,
Eric Dumazet <edumazet@...gle.com>,
Ed Cashin <ecashin@...aid.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [ 48/56] aoe: reserve enough headroom on skbs
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet <edumazet@...gle.com>
[ Upstream commit 91c5746425aed8f7188a351f1224a26aa232e4b3 ]
Some network drivers use a non default hard_header_len
Transmitted skb should take into account dev->hard_header_len, or risk
crashes or expensive reallocations.
In the case of aoe, lets reserve MAX_HEADER bytes.
David reported a crash in defxx driver, solved by this patch.
Reported-by: David Oostdyk <daveo@...mit.edu>
Tested-by: David Oostdyk <daveo@...mit.edu>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Ed Cashin <ecashin@...aid.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/block/aoe/aoecmd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -30,8 +30,9 @@ new_skb(ulong len)
{
struct sk_buff *skb;
- skb = alloc_skb(len, GFP_ATOMIC);
+ skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC);
if (skb) {
+ skb_reserve(skb, MAX_HEADER);
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb->protocol = __constant_htons(ETH_P_AOE);
--
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