isisd: prevent from accessing a non initialised pointer

When using bfd on a single level, one may access a null pointer
list. Prevent from using it.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/isisd/isis_bfd.c b/isisd/isis_bfd.c
index 1f50fb9342..5311a384e7 100644
--- a/isisd/isis_bfd.c
+++ b/isisd/isis_bfd.c
@@ -168,6 +168,8 @@ void isis_bfd_circuit_cmd(struct isis_circuit *circuit)
 			struct listnode *node;
 			struct isis_adjacency *adj;
 
+			if (!adjdb)
+				continue;
 			for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj))
 				bfd_adj_cmd(adj);
 		}