Commit 887464a4 authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by David S. Miller

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: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 66bf7918
......@@ -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;
......
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