netdev - [PATCH net 5/7] nf_tables: fix NULL pointer dereference in nft_inner

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Message-ID: <20231012085724.15155-6-fw@strlen.de>
Date: Thu, 12 Oct 2023 10:57:08 +0200
From: Florian Westphal <fw@...len.de>
To: <netdev@...r.kernel.org>
Cc: Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	<netfilter-devel@...r.kernel.org>,
	Xingyuan Mo <hdthky0@...il.com>
Subject: [PATCH net 5/7] nf_tables: fix NULL pointer dereference in nft_inner_init()

From: Xingyuan Mo <hdthky0@...il.com>

We should check whether the NFTA_INNER_NUM netlink attribute is present
before accessing it, otherwise a null pointer deference error will occur.

Call Trace:
 dump_stack_lvl+0x4f/0x90
 print_report+0x3f0/0x620
 kasan_report+0xcd/0x110
 __asan_load4+0x84/0xa0
 nft_inner_init+0x128/0x2e0
 nf_tables_newrule+0x813/0x1230
 nfnetlink_rcv_batch+0xec3/0x1170
 nfnetlink_rcv+0x1e4/0x220
 netlink_unicast+0x34e/0x4b0
 netlink_sendmsg+0x45c/0x7e0
 __sys_sendto+0x355/0x370
 __x64_sys_sendto+0x84/0xa0
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Fixes: 3a07327d10a0 ("netfilter: nft_inner: support for inner tunnel header matching")
Signed-off-by: Xingyuan Mo <hdthky0@...il.com>
Signed-off-by: Florian Westphal <fw@...len.de>
---
 net/netfilter/nft_inner.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nft_inner.c b/net/netfilter/nft_inner.c
index 28e2873ba24e..928312d01eb1 100644
--- a/net/netfilter/nft_inner.c
+++ b/net/netfilter/nft_inner.c
@@ -298,6 +298,7 @@ static int nft_inner_init(const struct nft_ctx *ctx,
 	int err;
 
 	if (!tb[NFTA_INNER_FLAGS] ||
+	    !tb[NFTA_INNER_NUM] ||
 	    !tb[NFTA_INNER_HDRSIZE] ||
 	    !tb[NFTA_INNER_TYPE] ||
 	    !tb[NFTA_INNER_EXPR])
-- 
2.41.0