| From | Luis Henriques <> | Subject | [PATCH 3.11 036/208] af_packet: block BH in prb_shutdown_retire_blk_timer() | Date | Thu, 19 Dec 2013 11:52:14 +0000 |
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3.11.10.2 -stable review patch. If anyone has any objections, please let me know.
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From: Veaceslav Falico <vfalico@redhat.com>
commit ec6f809ff6f19fafba3212f6aff0dda71dfac8e8 upstream.
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@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: Luis Henriques <luis.henriques@canonical.com> --- net/packet/af_packet.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index e7fdbd8..151e8ae 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -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); } -- 1.8.3.2
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