linux-kernel - [PATCH AUTOSEL for 4.9 182/293] netfilter: ebt

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Date:   Mon, 9 Apr 2018 00:25:16 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Liping Zhang <zlpnobody@...il.com>,
        Vishwanath Pai <vpai@...mai.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 182/293] netfilter: ebt_nflog: fix unexpected
 truncated packet

From: Liping Zhang <zlpnobody@...il.com>

[ Upstream commit 91af6ba7ff16bd7e5919aedfe70aad73a3375619 ]

"struct nf_loginfo li;" is a local variable, so we should set the flags
to 0 explicitly, else, packets maybe truncated unexpectedly when copied
to the userspace.

Fixes: 7643507fe8b5 ("netfilter: xt_NFLOG: nflog-range does not truncate packets")
Cc: Vishwanath Pai <vpai@...mai.com>
Signed-off-by: Liping Zhang <zlpnobody@...il.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 net/bridge/netfilter/ebt_nflog.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/bridge/netfilter/ebt_nflog.c b/net/bridge/netfilter/ebt_nflog.c
index 54816150608e..16d3c8261b9d 100644
--- a/net/bridge/netfilter/ebt_nflog.c
+++ b/net/bridge/netfilter/ebt_nflog.c
@@ -30,6 +30,7 @@ ebt_nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	li.u.ulog.copy_len = info->len;
 	li.u.ulog.group = info->group;
 	li.u.ulog.qthreshold = info->threshold;
+	li.u.ulog.flags = 0;
 
 	nf_log_packet(net, PF_BRIDGE, par->hooknum, skb, par->in,
 		      par->out, &li, "%s", info->prefix);
-- 
2.15.1