linux-kernel - [PATCH 5.15 845/846] bonding: Fix extraction of ports from the packet headers

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Date:   Mon, 24 Jan 2022 19:46:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jussi Maki <joamaki@...il.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Gal Pressman <gal@...dia.com>, Moshe Tal <moshet@...dia.com>,
        Jay Vosburgh <jay.vosburgh@...onical.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.15 845/846] bonding: Fix extraction of ports from the packet headers

From: Moshe Tal <moshet@...dia.com>

commit 429e3d123d9a50cc9882402e40e0ac912d88cfcf upstream.

Wrong hash sends single stream to multiple output interfaces.

The offset calculation was relative to skb->head, fix it to be relative
to skb->data.

Fixes: a815bde56b15 ("net, bonding: Refactor bond_xmit_hash for use with
xdp_buff")
Reviewed-by: Jussi Maki <joamaki@...il.com>
Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
Reviewed-by: Gal Pressman <gal@...dia.com>
Signed-off-by: Moshe Tal <moshet@...dia.com>
Acked-by: Jay Vosburgh <jay.vosburgh@...onical.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/bonding/bond_main.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3872,8 +3872,8 @@ u32 bond_xmit_hash(struct bonding *bond,
 	    skb->l4_hash)
 		return skb->hash;
 
-	return __bond_xmit_hash(bond, skb, skb->head, skb->protocol,
-				skb->mac_header, skb->network_header,
+	return __bond_xmit_hash(bond, skb, skb->data, skb->protocol,
+				skb_mac_offset(skb), skb_network_offset(skb),
 				skb_headlen(skb));
 }