netdev - [PATCH v1 nf 0/2] netfilter: iptables: Fix null-ptr-deref in ip6?table_nat_table

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Message-ID: <20240725192822.4478-1-kuniyu@amazon.com>
Date: Thu, 25 Jul 2024 12:28:19 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: Pablo Neira Ayuso <pablo@...filter.org>, Jozsef Kadlecsik
	<kadlec@...filter.org>
CC: Florian Westphal <fw@...len.de>, Kuniyuki Iwashima <kuniyu@...zon.com>,
	Kuniyuki Iwashima <kuni1840@...il.com>, <netfilter-devel@...r.kernel.org>,
	<coreteam@...filter.org>, <netdev@...r.kernel.org>
Subject: [PATCH v1 nf 0/2] netfilter: iptables: Fix null-ptr-deref in ip6?table_nat_table_init().

We had a report that iptables-restore sometimes triggered null-ptr-deref
at boot time.

The problem is that iptable_nat_table_init() is exposed to user space too
early and accesses net->gen->ptr[iptable_nat_net_ops.id] before allocated.

Patch 1 fixes the issue in iptable_nat, and patch 2 applies the same fix
to ip6table_nat.


Kuniyuki Iwashima (2):
  netfilter: iptables: Fix null-ptr-deref in iptable_nat_table_init().
  netfilter: iptables: Fix potential null-ptr-deref in
    ip6table_nat_table_init().

 net/ipv4/netfilter/iptable_nat.c  | 18 ++++++++++--------
 net/ipv6/netfilter/ip6table_nat.c | 14 +++++++++-----
 2 files changed, 19 insertions(+), 13 deletions(-)

-- 
2.30.2