This is a note to let you know that I've just added the patch titled
fib_trie: remove potential out of bound access
to the 3.0-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-remove-potential-out-of-bound-access.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 639d0c1b07b0dc3bf5be5e799ede96d72a16ce3d Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Mon, 5 Aug 2013 11:18:49 -0700
Subject: fib_trie: remove potential out of bound access
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit aab515d7c32a34300312416c50314e755ea6f765 ]
AddressSanitizer [1] dynamic checker pointed a potential
out of bound access in leaf_walk_rcu()
We could allocate one more slot in tnode_new() to leave the prefetch()
in-place but it looks not worth the pain.
Bug added in commit 82cfbb008572b ("[IPV4] fib_trie: iterator recode")
[1] :
https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerForKernel
Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/fib_trie.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -72,7 +72,6 @@
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
-#include <linux/prefetch.h>
#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/protocol.h>
@@ -1772,10 +1771,8 @@ static struct leaf *leaf_walk_rcu(struct
if (!c)
continue;
- if (IS_LEAF(c)) {
- prefetch(rcu_dereference_rtnl(p->child[idx]));
+ if (IS_LEAF(c))
return (struct leaf *) c;
- }
/* Rescan start scanning in new node */
p = (struct tnode *) c;
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-3.0/fib_trie-remove-potential-out-of-bound-access.patch
queue-3.0/net-check-net.core.somaxconn-sysctl-values.patch
queue-3.0/tcp-cubic-fix-bug-in-bictcp_acked.patch
queue-3.0/tcp-cubic-fix-overflow-error-in-bictcp_update.patch
queue-3.0/htb-fix-sign-extension-bug.patch
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