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af_packet: block BH in prb_shutdown_retire_blk_timer()

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[ Upstream commit ec6f809ff6 ]

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: f6fb8f100b ("af-packet: TPACKET_V3 flexible buffer implementation.")
CC: "David S. Miller" <davem@davemloft.net>
CC: Daniel Borkmann <dborkman@redhat.com>
CC: Willem de Bruijn <willemb@google.com>
CC: Phil Sutter <phil@nwl.cc>
CC: Eric Dumazet <edumazet@google.com>
Reported-by: Jan Stancek <jstancek@redhat.com>
Tested-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Veaceslav Falico 2013-11-29 09:53:23 +01:00 committed by Greg Kroah-Hartman
parent 026bb4057a
commit 5b9e9be775
1 changed files with 2 additions and 2 deletions
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4
net/packet/af_packet.c
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@ -439,9 +439,9 @@ static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
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);
}