Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755066AbaKYLp4 (ORCPT ); Tue, 25 Nov 2014 06:45:56 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:58291 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752958AbaKYKlH (ORCPT ); Tue, 25 Nov 2014 05:41:07 -0500 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Florian Westphal , Pablo Neira Ayuso , Luis Henriques Subject: [PATCH 3.16.y-ckt 064/254] netfilter: nf_log: account for size of NLMSG_DONE attribute Date: Tue, 25 Nov 2014 10:36:54 +0000 Message-Id: <1416912004-5928-65-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1416912004-5928-1-git-send-email-luis.henriques@canonical.com> References: <1416912004-5928-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.16 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.7-ckt2 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Florian Westphal commit 9dfa1dfe4d5e5e66a991321ab08afe69759d797a upstream. We currently neither account for the nlattr size, nor do we consider the size of the trailing NLMSG_DONE when allocating nlmsg skb. This can result in nflog to stop working, as __nfulnl_send() re-tries sending forever if it failed to append NLMSG_DONE (which will never work if buffer is not large enough). Reported-by: Houcheng Lin Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Luis Henriques --- net/netfilter/nfnetlink_log.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index d292c8d286eb..ebff1ec79ea2 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -649,7 +649,8 @@ nfulnl_log_packet(struct net *net, + nla_total_size(sizeof(u_int32_t)) /* gid */ + nla_total_size(plen) /* prefix */ + nla_total_size(sizeof(struct nfulnl_msg_packet_hw)) - + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)); + + nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp)) + + nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */ if (in && skb_mac_header_was_set(skb)) { size += nla_total_size(skb->dev->hard_header_len) @@ -692,8 +693,7 @@ nfulnl_log_packet(struct net *net, goto unlock_and_release; } - if (inst->skb && - size > skb_tailroom(inst->skb) - sizeof(struct nfgenmsg)) { + if (inst->skb && size > skb_tailroom(inst->skb)) { /* either the queue len is too high or we don't have * enough room in the skb left. flush to userspace. */ __nfulnl_flush(inst); -- 2.1.0 -- 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/