linux-kernel - Re: [PATCH 3.16 046/114] batman-adv: Fix broadcast/ogm queue limit on a removed interface

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Date:	Mon, 13 Jun 2016 23:53:06 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Sven Eckelmann <sven@...fation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org,
	Marek Lindner <mareklindner@...mailbox.ch>,
	Linus Lüssing <linus.luessing@...3.blue>,
	Antonio Quartulli <a@...table.cc>
Subject: Re: [PATCH 3.16 046/114] batman-adv: Fix broadcast/ogm queue limit
 on a removed interface

On Mon, 2016-06-13 at 21:33 +0200, Sven Eckelmann wrote:
> Hi,
> 
> looks like the patch is broken (at least it does something different than the 
> non-stable patch does).
> 
> On Monday 13 June 2016 19:36:37 Ben Hutchings wrote:
> > 3.16.36-rc1 review patch.  If anyone has any objections, please let me know.
> [...]
> > --- a/net/batman-adv/send.c
> > +++ b/net/batman-adv/send.c
> > @@ -638,6 +638,12 @@ batadv_purge_outstanding_packets(struct
> > 
> >  		if (pending) {
> >  			hlist_del(&forw_packet->list);
> > +			if (!forw_packet->own)
> > +				atomic_inc(&bat_priv->bcast_queue_left);
> > +
> > +			if (!forw_packet->own)
> > +				atomic_inc(&bat_priv->batman_queue_left);
> > +
> >  			batadv_forw_packet_free(forw_packet);
> >  		}
> >  	}
> 
> It seems to be a problem with the way GNU patch solved the conflicts with the 
> slightly different orig file (moved the hunks together when it shouldn't 
> have). GregKH also had this problem [1]

Yes, I recognise this bug.  I've updated this patch to the version below.

Ben.

---
batman-adv: Fix broadcast/ogm queue limit on a removed interface

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>
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
@@ -611,6 +611,9 @@ batadv_purge_outstanding_packets(struct
 
 		if (pending) {
 			hlist_del(&forw_packet->list);
+			if (!forw_packet->own)
+				atomic_inc(&bat_priv->bcast_queue_left);
+
 			batadv_forw_packet_free(forw_packet);
 		}
 	}
@@ -638,6 +641,9 @@ batadv_purge_outstanding_packets(struct
 
 		if (pending) {
 			hlist_del(&forw_packet->list);
+			if (!forw_packet->own)
+				atomic_inc(&bat_priv->batman_queue_left);
+
 			batadv_forw_packet_free(forw_packet);
 		}
 	}

-- 
Ben Hutchings
One of the nice things about standards is that there are so many of
them.


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