linux-kernel - [PATCH 3.2 27/46] batman-adv: Fix broadcast/ogm queue limit on a removed interface

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Message-ID: <lsq.1465767282.499699595@decadent.org.uk>
Date:	Sun, 12 Jun 2016 22:34:42 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Marek Lindner" <mareklindner@...mailbox.ch>,
	"Linus Lüssing" <linus.luessing@...3.blue>,
	"Sven Eckelmann" <sven@...fation.org>,
	"Antonio Quartulli" <a@...table.cc>
Subject: [PATCH 3.2 27/46] batman-adv: Fix broadcast/ogm queue limit on a
 removed interface

3.2.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Lüssing <linus.luessing@...3.blue>

commit c4fdb6cff2aa0ae740c5f19b6f745cbbe786d42f upstream.

When removing a single interface while a broadcast or ogm packet is
still pending then we will free the forward packet without releasing the
queue slots again.

This patch is supposed to fix this issue.

Fixes: 6d5808d4ae1b ("batman-adv: Add missing hardif_free_ref in forw_packet_free")
Signed-off-by: Linus Lüssing <linus.luessing@...3.blue>
[sven@...fation.org: fix conflicts with current version]
Signed-off-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch>
Signed-off-by: Antonio Quartulli <a@...table.cc>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/batman-adv/send.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -375,6 +375,9 @@ void purge_outstanding_packets(struct ba
 
 		if (pending) {
 			hlist_del(&forw_packet->list);
+			if (!forw_packet->own)
+				atomic_inc(&bat_priv->bcast_queue_left);
+
 			forw_packet_free(forw_packet);
 		}
 	}
@@ -404,6 +407,9 @@ void purge_outstanding_packets(struct ba
 
 		if (pending) {
 			hlist_del(&forw_packet->list);
+			if (!forw_packet->own)
+				atomic_inc(&bat_priv->batman_queue_left);
+
 			forw_packet_free(forw_packet);
 		}
 	}