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-rw-r--r--net/netfilter/nf_conntrack_helper.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 2918ec2..c4bc637 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -229,7 +229,13 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
goto out;
}
} else {
- memset(help->data, 0, helper->data_len);
+ /* We only allow helper re-assignment of the same sort since
+ * we cannot reallocate the helper extension area.
+ */
+ if (help->helper != helper) {
+ RCU_INIT_POINTER(help->helper, NULL);
+ goto out;
+ }
}
rcu_assign_pointer(help->helper, helper);