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Date: Thu, 12 Sep 2013 10:45:01 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Andrey Konovalov <andreyknvl@...gle.com>, Eric Dumazet <edumazet@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, "David S. Miller" <davem@...emloft.net> Subject: [ 05/23] fib_trie: remove potential out of bound access 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet <edumazet@...gle.com> [ 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@...gle.com> Signed-off-by: Eric Dumazet <edumazet@...gle.com> Cc: Dmitry Vyukov <dvyukov@...gle.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- 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 @@ -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> @@ -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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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