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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-08-07 02:34:31 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-09-14 06:54:54 -0700
commit24e8ac721e0e13cab478bd190977daac48b6146c (patch)
treeb7c3f56493b4486c537dc8a8dc3091fd3b00cf27
parentca02d414915693909f9d7f455c4598d3f8b514b3 (diff)
ipv6: don't stop backtracking in fib6_lookup_1 if subtree does not match
[ Upstream commit 3e3be275851bc6fc90bfdcd732cd95563acd982b ] In case a subtree did not match we currently stop backtracking and return NULL (root table from fib_lookup). This could yield in invalid routing table lookups when using subtrees. Instead continue to backtrack until a valid subtree or node is found and return this match. Also remove unneeded NULL check. Reported-by: Teco Boot <teco@inf-net.nl> Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Cc: David Lamparter <equinox@diac24.net> Cc: <boutier@pps.univ-paris-diderot.fr> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/ipv6/ip6_fib.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 5fc9c7a68d8d..2221ff6a308b 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -993,14 +993,22 @@ static struct fib6_node * fib6_lookup_1(struct fib6_node *root,
if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) {
#ifdef CONFIG_IPV6_SUBTREES
- if (fn->subtree)
- fn = fib6_lookup_1(fn->subtree, args + 1);
+ if (fn->subtree) {
+ struct fib6_node *sfn;
+ sfn = fib6_lookup_1(fn->subtree,
+ args + 1);
+ if (!sfn)
+ goto backtrack;
+ fn = sfn;
+ }
#endif
- if (!fn || fn->fn_flags & RTN_RTINFO)
+ if (fn->fn_flags & RTN_RTINFO)
return fn;
}
}
-
+#ifdef CONFIG_IPV6_SUBTREES
+backtrack:
+#endif
if (fn->fn_flags & RTN_ROOT)
break;