linux-kernel - [PATCH 4.14 70/99] batman-adv: Fix lock for ogm cnt access in batadv_iv_ogm_calc

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Date:   Thu, 19 Mar 2020 14:03:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sven Eckelmann <sven@...fation.org>,
        Simon Wunderlich <sw@...onwunderlich.de>
Subject: [PATCH 4.14 70/99] batman-adv: Fix lock for ogm cnt access in batadv_iv_ogm_calc_tq

From: Sven Eckelmann <sven@...fation.org>

commit 5ba7dcfe77037b67016263ea597a8b431692ecab upstream.

The originator node object orig_neigh_node is used to when accessing the
bcast_own(_sum) and real_packet_count information. The access to them has
to be protected with the spinlock in orig_neigh_node.

But the function uses the lock in orig_node instead. This is incorrect
because they could be two different originator node objects.

Fixes: 0ede9f41b217 ("batman-adv: protect bit operations to count OGMs with spinlock")
Signed-off-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/batman-adv/bat_iv_ogm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -1220,7 +1220,7 @@ static bool batadv_iv_ogm_calc_tq(struct
 	orig_node->last_seen = jiffies;
 
 	/* find packet count of corresponding one hop neighbor */
-	spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
+	spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
 	if_num = if_incoming->if_num;
 	orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
 	neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
@@ -1230,7 +1230,7 @@ static bool batadv_iv_ogm_calc_tq(struct
 	} else {
 		neigh_rq_count = 0;
 	}
-	spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
+	spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
 
 	/* pay attention to not get a value bigger than 100 % */
 	if (orig_eq_count > neigh_rq_count)