This is a note to let you know that I've just added the patch titled
af_packet: block BH in prb_shutdown_retire_blk_timer()
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
af_packet-block-bh-in-prb_shutdown_retire_blk_timer.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Dec 5 16:16:39 PST 2013
From: Veaceslav Falico <vfalico@xxxxxxxxxx>
Date: Fri, 29 Nov 2013 09:53:23 +0100
Subject: af_packet: block BH in prb_shutdown_retire_blk_timer()
From: Veaceslav Falico <vfalico@xxxxxxxxxx>
[ Upstream commit ec6f809ff6f19fafba3212f6aff0dda71dfac8e8 ]
Currently we're using plain spin_lock() in prb_shutdown_retire_blk_timer(),
however the timer might fire right in the middle and thus try to re-aquire
the same spinlock, leaving us in a endless loop.
To fix that, use the spin_lock_bh() to block it.
Fixes: f6fb8f100b80 ("af-packet: TPACKET_V3 flexible buffer implementation.")
CC: "David S. Miller" <davem@xxxxxxxxxxxxx>
CC: Daniel Borkmann <dborkman@xxxxxxxxxx>
CC: Willem de Bruijn <willemb@xxxxxxxxxx>
CC: Phil Sutter <phil@xxxxxx>
CC: Eric Dumazet <edumazet@xxxxxxxxxx>
Reported-by: Jan Stancek <jstancek@xxxxxxxxxx>
Tested-by: Jan Stancek <jstancek@xxxxxxxxxx>
Signed-off-by: Veaceslav Falico <vfalico@xxxxxxxxxx>
Acked-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/packet/af_packet.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -439,9 +439,9 @@ static void prb_shutdown_retire_blk_time
pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
- spin_lock(&rb_queue->lock);
+ spin_lock_bh(&rb_queue->lock);
pkc->delete_blk_timer = 1;
- spin_unlock(&rb_queue->lock);
+ spin_unlock_bh(&rb_queue->lock);
prb_del_retire_blk_timer(pkc);
}
Patches currently in stable-queue which might be from vfalico@xxxxxxxxxx are
queue-3.12/af_packet-block-bh-in-prb_shutdown_retire_blk_timer.patch
queue-3.12/bonding-don-t-permit-to-use-arp-monitoring-in-802.3ad.patch
queue-3.12/bonding-fix-two-race-conditions-in.patch
queue-3.12/bonding-rcuify-bond_set_rx_mode.patch
queue-3.12/net-core-always-propagate-flag-changes-to-interfaces.patch
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