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authorPavel Emelyanov <xemul@openvz.org>2008-06-27 20:06:08 -0700
committerDavid S. Miller <davem@davemloft.net>2008-06-27 20:06:08 -0700
commit9a375803feaadb6c34e0807bd9325885dcca5c00 (patch)
treefba3b0835d1fb3211da1c1be9dd6d4508e6668a6 /net/ipv6
parenta0a61a604c60c14accc3962ecfeee9acc7a3c08a (diff)
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.c3
-rw-r--r--net/ipv6/reassembly.c2
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);