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| author | Pavel Emelyanov <xemul@openvz.org> | 2008-06-27 20:06:08 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-06-27 20:06:08 -0700 |
| commit | 9a375803feaadb6c34e0807bd9325885dcca5c00 (patch) | |
| tree | fba3b0835d1fb3211da1c1be9dd6d4508e6668a6 /net/ipv6 | |
| parent | a0a61a604c60c14accc3962ecfeee9acc7a3c08a (diff) | |
| download | blackbird-op-linux-9a375803feaadb6c34e0807bd9325885dcca5c00.tar.gz blackbird-op-linux-9a375803feaadb6c34e0807bd9325885dcca5c00.zip | |
inet fragments: fix race between inet_frag_find and inet_frag_secret_rebuild
The problem is that while we work w/o the inet_frags.lock even
read-locked the secret rebuild timer may occur (on another CPU, since
BHs are still disabled in the inet_frag_find) and change the rnd seed
for ipv4/6 fragments.
It was caused by my patch fd9e63544cac30a34c951f0ec958038f0529e244
([INET]: Omit double hash calculations in xxx_frag_intern) late
in the 2.6.24 kernel, so this should probably be queued to -stable.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/netfilter/nf_conntrack_reasm.c | 3 | ||||
| -rw-r--r-- | net/ipv6/reassembly.c | 2 |
2 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c index e65e26e210ee..cf20bc4fd60d 100644 --- a/net/ipv6/netfilter/nf_conntrack_reasm.c +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -207,9 +207,10 @@ fq_find(__be32 id, struct in6_addr *src, struct in6_addr *dst) arg.id = id; arg.src = src; arg.dst = dst; + + read_lock_bh(&nf_frags.lock); hash = ip6qhashfn(id, src, dst); - local_bh_disable(); q = inet_frag_find(&nf_init_frags, &nf_frags, &arg, hash); local_bh_enable(); if (q == NULL) diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c index 798cabc7535b..a60d7d129713 100644 --- a/net/ipv6/reassembly.c +++ b/net/ipv6/reassembly.c @@ -247,6 +247,8 @@ fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst, arg.id = id; arg.src = src; arg.dst = dst; + + read_lock(&ip6_frags.lock); hash = ip6qhashfn(id, src, dst); q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash); |
