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authorAlexey Dobriyan <adobriyan@gmail.com>2008-09-07 18:20:08 -0700
committerDavid S. Miller <davem@davemloft.net>2008-09-07 18:20:08 -0700
commit887464a41fde7e9e1e11ca86748338033c502446 (patch)
treeadd59cbaf1f8fc207cb0d2bbd18e1ac97a355246 /net
parent66bf79182d6531c14c1f9a507b6bbf374a2ae4cd (diff)
downloadlinux-887464a41fde7e9e1e11ca86748338033c502446.tar.bz2
netfilter: nf_conntrack_gre: more locking around keymap list
gre_keymap_list should be protected in all places. (unless I'm misreading something) Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_conntrack_proto_gre.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
index 654a4f7f12c6..b308bb4c12b9 100644
--- a/net/netfilter/nf_conntrack_proto_gre.c
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -97,10 +97,14 @@ int nf_ct_gre_keymap_add(struct nf_conn *ct, enum ip_conntrack_dir dir,
kmp = &help->help.ct_pptp_info.keymap[dir];
if (*kmp) {
/* check whether it's a retransmission */
+ read_lock_bh(&nf_ct_gre_lock);
list_for_each_entry(km, &gre_keymap_list, list) {
- if (gre_key_cmpfn(km, t) && km == *kmp)
+ if (gre_key_cmpfn(km, t) && km == *kmp) {
+ read_unlock_bh(&nf_ct_gre_lock);
return 0;
+ }
}
+ read_unlock_bh(&nf_ct_gre_lock);
pr_debug("trying to override keymap_%s for ct %p\n",
dir == IP_CT_DIR_REPLY ? "reply" : "orig", ct);
return -EEXIST;