From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Eric Dumazet , Ed Cashin , "David S. Miller" , Luis Henriques Subject: [PATCH 072/102] aoe: reserve enough headroom on skbs Date: Mon, 8 Apr 2013 10:50:27 +0100 Message-Id: <1365414657-29191-73-git-send-email-luis.henriques@canonical.com> In-Reply-To: <1365414657-29191-1-git-send-email-luis.henriques@canonical.com> References: <1365414657-29191-1-git-send-email-luis.henriques@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.5.7.10 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet commit 91c5746425aed8f7188a351f1224a26aa232e4b3 upstream. 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 Tested-by: David Oostdyk Signed-off-by: Eric Dumazet Cc: Ed Cashin Signed-off-by: David S. Miller Signed-off-by: Luis Henriques --- drivers/block/aoe/aoecmd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 887f68f..db30542 100644 --- 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); -- 1.8.1.2