[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20180823074922.785896638@linuxfoundation.org>
Date: Thu, 23 Aug 2018 09:53:32 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Willem de Bruijn <willemb@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 56/79] packet: reset network header if packet shorter than ll reserved space
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Willem de Bruijn <willemb@...gle.com>
[ Upstream commit 993675a3100b16a4c80dfd70cbcde8ea7127b31d ]
If variable length link layer headers result in a packet shorter
than dev->hard_header_len, reset the network header offset. Else
skb->mac_len may exceed skb->len after skb_mac_reset_len.
packet_sendmsg_spkt already has similar logic.
Fixes: b84bbaf7a6c8 ("packet: in packet_snd start writing at link layer allocation")
Signed-off-by: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
net/packet/af_packet.c | 2 ++
1 file changed, 2 insertions(+)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2780,6 +2780,8 @@ static int packet_snd(struct socket *soc
goto out_free;
} else if (reserve) {
skb_reserve(skb, -reserve);
+ if (len < reserve)
+ skb_reset_network_header(skb);
}
/* Returns -EFAULT on error */
Powered by blists - more mailing lists