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| author | Eric Dumazet <edumazet@google.com> | 2013-08-05 11:18:49 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-05 15:26:11 -0700 |
| commit | aab515d7c32a34300312416c50314e755ea6f765 (patch) | |
| tree | 74e52aee3e58a487d4cdb409c18cd421ea9d91ce | |
| parent | 3b380877d58604686c2526c19154d656c25d2953 (diff) | |
| download | linux-stable-aab515d7c32a34300312416c50314e755ea6f765.tar.gz linux-stable-aab515d7c32a34300312416c50314e755ea6f765.tar.bz2 linux-stable-aab515d7c32a34300312416c50314e755ea6f765.zip | |
fib_trie: remove potential out of bound access
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>
| -rw-r--r-- | net/ipv4/fib_trie.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index 108a1e9c9eac..3df6d3edb2a1 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -71,7 +71,6 @@ #include <linux/init.h> #include <linux/list.h> #include <linux/slab.h> -#include <linux/prefetch.h> #include <linux/export.h> #include <net/net_namespace.h> #include <net/ip.h> @@ -1761,10 +1760,8 @@ 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; |