[PATCH] rib: fix traversal with /32 route

[Stephen Hemminger <stephen@networkplumber.org>]

If a /32 route is entered in the RIB the code to traverse
will not see that a a end of the tree. This is due to trying
to do a negative shift which is an undefined in C.

Fix by checking for max depth as is already done in rib6.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/rib/rte_rib.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/rib/rte_rib.c b/lib/rib/rte_rib.c
index cd9e823068d2..0603980cabd2 100644
--- a/lib/rib/rte_rib.c
+++ b/lib/rib/rte_rib.c
@@ -71,6 +71,8 @@ is_covered(uint32_t ip1, uint32_t ip2, uint8_t depth)
 static inline struct rte_rib_node *
 get_nxt_node(struct rte_rib_node *node, uint32_t ip)
 {
+	if (node->depth == RIB_MAXDEPTH)
+		return NULL;
 	return (ip & (1 << (31 - node->depth))) ? node->right : node->left;
 }
 
-- 
2.35.1