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authorEric Dumazet <edumazet@google.com>2013-08-05 11:18:49 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-09-14 05:50:47 -0700
commit45ff4d68f223419b7d77bc64cb4bbc0bc86c54d4 (patch)
treebd7095aba18bcacab9521a9efd3964bedea34dfd
parentf879090a22c5a3c34ff7a60363078e28450e3005 (diff)
fib_trie: remove potential out of bound access
[ 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@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/ipv4/fib_trie.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 0d884eb2b14f..e11f4a57483d 100644
--- 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 tnode *p, struct rt_trie_node *c)
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;