[IPV6] ROUTE: Make sure we do not exceed args in fib6_lookup_1().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Ville Nuorvala <vnuorval@tcs.hut.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 7 deletions

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 5408b64f3b5f..19ee7375daa9 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -829,6 +829,9 @@ static struct fib6_node * fib6_lookup_1(struct fib6_node *root,
         struct fib6_node *fn;
         int dir;
 
+        if (unlikely(args->offset == 0))
+                return NULL;
+
         /*
          *      Descend on a tree
          */
@@ -879,16 +882,22 @@ static struct fib6_node * fib6_lookup_1(struct fib6_node *root,
 struct fib6_node * fib6_lookup(struct fib6_node *root, struct in6_addr *daddr,
                                struct in6_addr *saddr)
 {
-        struct lookup_args args[2];
         struct fib6_node *fn;
-
-        args[0].offset = offsetof(struct rt6_info, rt6i_dst);
-        args[0].addr = daddr;
-
+        struct lookup_args args[] = {
+                {
+                        .offset = offsetof(struct rt6_info, rt6i_dst),
+                        .addr = daddr,
+                },
 #ifdef CONFIG_IPV6_SUBTREES
-        args[1].offset = offsetof(struct rt6_info, rt6i_src);
-        args[1].addr = saddr;
+                {
+                        .offset = offsetof(struct rt6_info, rt6i_src),
+                        .addr = saddr,
+                },
 #endif
+                {
+                        .offset = 0,    /* sentinel */
+                }
+        };
 
         fn = fib6_lookup_1(root, args);