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 a2871188e69b32b852f3868fe6ca80b1fbebe96e..a982f288290212e862abfaea10b06465c8f66074 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)) {