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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-06-09 20:21:07 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-11 09:47:08 +0400 |
| commit | 592fcb9dfafaa02dd0edc207bf5d3a0ee7a1f8df (patch) | |
| tree | 3b7bbd5313c7f564cf8087658c36d32a87ca79c4 /include/net/ip.h | |
| parent | 96b52e61be1ad4d4f8de39b9deaf253da804ea3b (diff) | |
| download | linux-592fcb9dfafaa02dd0edc207bf5d3a0ee7a1f8df.tar.xz | |
ip: ip_ra_control() rcu fix
commit 66018506e15b (ip: Router Alert RCU conversion) introduced RCU
lookups to ip_call_ra_chain(). It missed proper deinit phase :
When ip_ra_control() deletes an ip_ra_chain, it should make sure
ip_call_ra_chain() users can not start to use socket during the rcu
grace period. It should also delay the sock_put() after the grace
period, or we risk a premature socket freeing and corruptions, as
raw sockets are not rcu protected yet.
This delay avoids using expensive atomic_inc_not_zero() in
ip_call_ra_chain().
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip.h')
| -rw-r--r-- | include/net/ip.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/net/ip.h b/include/net/ip.h index 9982c97f0bdc..d52f01180361 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -61,7 +61,10 @@ struct ipcm_cookie { struct ip_ra_chain { struct ip_ra_chain *next; struct sock *sk; - void (*destructor)(struct sock *); + union { + void (*destructor)(struct sock *); + struct sock *saved_sk; + }; struct rcu_head rcu; }; |