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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2012-08-29 16:25:49 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-21 09:28:00 -0700 |
| commit | 7fcbcdc96302e9d3e3b36df4fbc86a4c82761092 (patch) | |
| tree | 770030ce43176a21b837307e7f8a4474d95d7296 /include | |
| parent | 486aaeb0b972820ed704bdf416270ec4b0950da3 (diff) | |
| download | lwn-7fcbcdc96302e9d3e3b36df4fbc86a4c82761092.tar.gz lwn-7fcbcdc96302e9d3e3b36df4fbc86a4c82761092.zip | |
netfilter: nf_conntrack: fix racy timer handling with reliable events
commit 5b423f6a40a0327f9d40bc8b97ce9be266f74368 upstream.
Existing code assumes that del_timer returns true for alive conntrack
entries. However, this is not true if reliable events are enabled.
In that case, del_timer may return true for entries that were
just inserted in the dying list. Note that packets / ctnetlink may
hold references to conntrack entries that were just inserted to such
list.
This patch fixes the issue by adding an independent timer for
event delivery. This increases the size of the ecache extension.
Still we can revisit this later and use variable size extensions
to allocate this area on demand.
Tested-by: Oliver Smith <olipro@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/netfilter/nf_conntrack_ecache.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_ecache.h b/include/net/netfilter/nf_conntrack_ecache.h index a88fb6939387..ea6f8a48ffe5 100644 --- a/include/net/netfilter/nf_conntrack_ecache.h +++ b/include/net/netfilter/nf_conntrack_ecache.h @@ -18,6 +18,7 @@ struct nf_conntrack_ecache { u16 ctmask; /* bitmask of ct events to be delivered */ u16 expmask; /* bitmask of expect events to be delivered */ u32 pid; /* netlink pid of destroyer */ + struct timer_list timeout; }; static inline struct nf_conntrack_ecache * |