bgpd: fix bug while iterating over VPN table

The routing table data structure can create intermediate route nodes
during its normal operation, so we always need to check if the 'info'
pointer of a route node is NULL or not before dereferencing it.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

diff --git a/bgpd/rfapi/vnc_zebra.c b/bgpd/rfapi/vnc_zebra.c
index a57f908f620c76286bb749e354ba8aecdd22b343..158c88da1670b4f901be8a721937491a0a296a2d 100644 (file)
--- a/bgpd/rfapi/vnc_zebra.c
+++ b/bgpd/rfapi/vnc_zebra.c
@@ -313,6 +313,8 @@ static void vnc_redistribute_withdraw(struct bgp *bgp, afi_t afi, uint8_t type)
 
                /* This is the per-RD table of prefixes */
                table = prn->info;
+               if (!table)
+                       continue;
 
                for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {