linux-kernel - [PATCH 4.2 013/124] fib_trie: leaf_walk_rcu should not compute key if key is less than pn->key

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Date:	Mon,  7 Dec 2015 09:55:03 -0500
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Brian Rak <brak@...eservers.com>,
	Alexander Duyck <aduyck@...antis.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.2 013/124] fib_trie: leaf_walk_rcu should not compute key if key is less than pn->key

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Duyck <aduyck@...antis.com>

[ Upstream commit c2229fe1430d4e1c70e36520229dd64a87802b20 ]

We were computing the child index in cases where the key value we were
looking for was actually less than the base key of the tnode.  As a result
we were getting incorrect index values that would cause us to skip over
some children.

To fix this I have added a test that will force us to use child index 0 if
the key we are looking for is less than the key of the current tnode.

Fixes: 8be33e955cb9 ("fib_trie: Fib walk rcu should take a tnode and key instead of a trie and a leaf")
Reported-by: Brian Rak <brak@...eservers.com>
Signed-off-by: Alexander Duyck <aduyck@...antis.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/fib_trie.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1561,7 +1561,7 @@ static struct key_vector *leaf_walk_rcu(
 	do {
 		/* record parent and next child index */
 		pn = n;
-		cindex = key ? get_index(key, pn) : 0;
+		cindex = (key > pn->key) ? get_index(key, pn) : 0;
 
 		if (cindex >> pn->bits)
 			break;


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