Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754666Ab1CKABF (ORCPT ); Thu, 10 Mar 2011 19:01:05 -0500 Received: from kroah.org ([198.145.64.141]:46857 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754503Ab1CJX5W (ORCPT ); Thu, 10 Mar 2011 18:57:22 -0500 X-Mailbox-Line: From gregkh@clark.kroah.org Thu Mar 10 15:55:37 2011 Message-Id: <20110310235537.329438570@clark.kroah.org> User-Agent: quilt/0.48-16.4 Date: Thu, 10 Mar 2011 15:54:19 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Jan Engelhardt , Patrick McHardy Subject: [patch 13/29] netfilter: nf_log: avoid oops in (un)bind with invalid nfproto values In-Reply-To: <20110310235548.GA10103@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1951 Lines: 59 2.6.37-stable review patch. If anyone has any objections, please let us know. ------------------ From: Jan Engelhardt commit 9ef0298a8e5730d9a46d640014c727f3b4152870 upstream. Like many other places, we have to check that the array index is within allowed limits, or otherwise, a kernel oops and other nastiness can ensue when we access memory beyond the end of the array. [ 5954.115381] BUG: unable to handle kernel paging request at 0000004000000000 [ 5954.120014] IP: __find_logger+0x6f/0xa0 [ 5954.123979] nf_log_bind_pf+0x2b/0x70 [ 5954.123979] nfulnl_recv_config+0xc0/0x4a0 [nfnetlink_log] [ 5954.123979] nfnetlink_rcv_msg+0x12c/0x1b0 [nfnetlink] ... The problem goes back to v2.6.30-rc1~1372~1342~31 where nf_log_bind was decoupled from nf_log_register. Reported-by: Miguel Di Ciurcio Filho , via irc.freenode.net/#netfilter Signed-off-by: Jan Engelhardt Signed-off-by: Patrick McHardy Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nf_log.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -85,6 +85,8 @@ EXPORT_SYMBOL(nf_log_unregister); int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger) { + if (pf >= ARRAY_SIZE(nf_loggers)) + return -EINVAL; mutex_lock(&nf_log_mutex); if (__find_logger(pf, logger->name) == NULL) { mutex_unlock(&nf_log_mutex); @@ -98,6 +100,8 @@ EXPORT_SYMBOL(nf_log_bind_pf); void nf_log_unbind_pf(u_int8_t pf) { + if (pf >= ARRAY_SIZE(nf_loggers)) + return; mutex_lock(&nf_log_mutex); rcu_assign_pointer(nf_loggers[pf], NULL); mutex_unlock(&nf_log_mutex); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/