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| author | Willem de Bruijn <willemb@google.com> | 2015-06-16 12:51:37 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-06-21 09:30:42 -0700 |
| commit | 59f211181b5b10d4a95e1b9226febb0c0b6497c6 (patch) | |
| tree | 2f9ee4c3d1c9687d50b179fe63650ce55ac8daf4 /net | |
| parent | 120119623b6798b70384248c0cacf8f8de419c9a (diff) | |
| download | linux-59f211181b5b10d4a95e1b9226febb0c0b6497c6.tar.gz linux-59f211181b5b10d4a95e1b9226febb0c0b6497c6.tar.bz2 linux-59f211181b5b10d4a95e1b9226febb0c0b6497c6.zip | |
packet: free packet_rollover after synchronize_net
Destruction of the po->rollover must be delayed until there are no
more packets in flight that can access it. The field is destroyed in
packet_release, before synchronize_net. Delay using rcu.
Fixes: 0648ab70afe6 ("packet: rollover prepare: per-socket state")
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/packet/af_packet.c | 3 | ||||
| -rw-r--r-- | net/packet/internal.h | 1 |
2 files changed, 3 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index fd5164139bf0..20e8c40da90d 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1634,7 +1634,8 @@ static void fanout_release(struct sock *sk) } mutex_unlock(&fanout_mutex); - kfree(po->rollover); + if (po->rollover) + kfree_rcu(po->rollover, rcu); } static const struct proto_ops packet_ops; diff --git a/net/packet/internal.h b/net/packet/internal.h index c035d263c1e8..e20b3e8829b8 100644 --- a/net/packet/internal.h +++ b/net/packet/internal.h @@ -89,6 +89,7 @@ struct packet_fanout { struct packet_rollover { int sock; + struct rcu_head rcu; atomic_long_t num; atomic_long_t num_huge; atomic_long_t num_failed; |