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51 lines
1.8 KiB
Diff
51 lines
1.8 KiB
Diff
From 223b02d923ecd7c84cf9780bb3686f455d279279 Mon Sep 17 00:00:00 2001
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From: Andrey Vagin <avagin@openvz.org>
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Date: Fri, 28 Mar 2014 13:54:32 +0400
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Subject: [PATCH] netfilter: nf_conntrack: reserve two bytes for nf_ct_ext->len
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"len" contains sizeof(nf_ct_ext) and size of extensions. In a worst
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case it can contain all extensions. Bellow you can find sizes for all
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types of extensions. Their sum is definitely bigger than 256.
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nf_ct_ext_types[0]->len = 24
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nf_ct_ext_types[1]->len = 32
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nf_ct_ext_types[2]->len = 24
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nf_ct_ext_types[3]->len = 32
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nf_ct_ext_types[4]->len = 152
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nf_ct_ext_types[5]->len = 2
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nf_ct_ext_types[6]->len = 16
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nf_ct_ext_types[7]->len = 8
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I have seen "len" up to 280 and my host has crashes w/o this patch.
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The right way to fix this problem is reducing the size of the ecache
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extension (4) and Florian is going to do this, but these changes will
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be quite large to be appropriate for a stable tree.
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Fixes: 5b423f6a40a0 (netfilter: nf_conntrack: fix racy timer handling with reliable)
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Cc: Pablo Neira Ayuso <pablo@netfilter.org>
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Cc: Patrick McHardy <kaber@trash.net>
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Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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Cc: "David S. Miller" <davem@davemloft.net>
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Signed-off-by: Andrey Vagin <avagin@openvz.org>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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include/net/netfilter/nf_conntrack_extend.h | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
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index 956b175523ffa..55d15049ab2fd 100644
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--- a/include/net/netfilter/nf_conntrack_extend.h
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+++ b/include/net/netfilter/nf_conntrack_extend.h
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@@ -47,8 +47,8 @@ enum nf_ct_ext_id {
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/* Extensions: optional stuff which isn't permanently in struct. */
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struct nf_ct_ext {
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struct rcu_head rcu;
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- u8 offset[NF_CT_EXT_NUM];
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- u8 len;
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+ u16 offset[NF_CT_EXT_NUM];
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+ u16 len;
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char data[0];
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};
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