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path: root/net/netfilter/nf_conntrack_helper.c
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Diffstat (limited to 'net/netfilter/nf_conntrack_helper.c')
-rw-r--r--net/netfilter/nf_conntrack_helper.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 2f380f73c4c..1343a4bb403 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -236,7 +236,9 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
/* We only allow helper re-assignment of the same sort since
* we cannot reallocate the helper extension area.
*/
- if (help->helper != helper) {
+ struct nf_conntrack_helper *tmp = rcu_dereference(help->helper);
+
+ if (tmp && tmp->help != helper->help) {
RCU_INIT_POINTER(help->helper, NULL);
goto out;
}