netfilter: nf_conntrack_sip: de-static helper pointers

Helper's ->help hook can run concurrently with itself, so iterating over
SIP helpers with static pointer won't work reliably.

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>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 2f9bbc058b48..1fa306be60fb 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -1193,7 +1193,6 @@ static const struct sip_handler sip_handlers[] = {
 static int process_sip_response(struct sk_buff *skb,
                                 const char **dptr, unsigned int *datalen)
 {
-        static const struct sip_handler *handler;
         enum ip_conntrack_info ctinfo;
         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
         unsigned int matchoff, matchlen;
@@ -1214,6 +1213,8 @@ static int process_sip_response(struct sk_buff *skb,
         dataoff = matchoff + matchlen + 1;
 
         for (i = 0; i < ARRAY_SIZE(sip_handlers); i++) {
+                const struct sip_handler *handler;
+
                 handler = &sip_handlers[i];
                 if (handler->response == NULL)
                         continue;
@@ -1228,13 +1229,14 @@ static int process_sip_response(struct sk_buff *skb,
 static int process_sip_request(struct sk_buff *skb,
                                const char **dptr, unsigned int *datalen)
 {
-        static const struct sip_handler *handler;
         enum ip_conntrack_info ctinfo;
         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
         unsigned int matchoff, matchlen;
         unsigned int cseq, i;
 
         for (i = 0; i < ARRAY_SIZE(sip_handlers); i++) {
+                const struct sip_handler *handler;
+
                 handler = &sip_handlers[i];
                 if (handler->request == NULL)
                         continue;