This is a note to let you know that I've just added the patch titled
fib_trie: leaf_walk_rcu should not compute key if key is less than pn->key
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fib_trie-leaf_walk_rcu-should-not-compute-key-if-key-is-less-than-pn-key.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Nov 17 14:34:38 PST 2015
From: Alexander Duyck <aduyck@xxxxxxxxxxxx>
Date: Tue, 27 Oct 2015 15:06:45 -0700
Subject: fib_trie: leaf_walk_rcu should not compute key if key is less than pn->key
From: Alexander Duyck <aduyck@xxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Duyck <aduyck@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
Patches currently in stable-queue which might be from aduyck@xxxxxxxxxxxx are
queue-4.2/fib_trie-leaf_walk_rcu-should-not-compute-key-if-key-is-less-than-pn-key.patch
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