From: Florian Westphal <fw@strlen•de>
To: <netdev@vger•kernel.org>
Cc: davem@davemloft•net, netfilter-devel@vger•kernel.org,
kuba@kernel•org, pabeni@redhat•com, edumazet@google•com,
Pablo Neira Ayuso <pablo@netfilter•org>,
syzbot+5fcdbfab6d6744c57418@syzkaller•appspotmail.com
Subject: [PATCH net 3/4] netfilter: nf_tables: clean up hook list when offload flags check fails
Date: Thu, 1 Sep 2022 09:12:37 +0200 [thread overview]
Message-ID: <20220901071238.3044-4-fw@strlen.de> (raw)
In-Reply-To: <20220901071238.3044-1-fw@strlen.de>
From: Pablo Neira Ayuso <pablo@netfilter•org>
splice back the hook list so nft_chain_release_hook() has a chance to
release the hooks.
BUG: memory leak
unreferenced object 0xffff88810180b100 (size 96):
comm "syz-executor133", pid 3619, jiffies 4294945714 (age 12.690s)
hex dump (first 32 bytes):
28 64 23 02 81 88 ff ff 28 64 23 02 81 88 ff ff (d#.....(d#.....
90 a8 aa 83 ff ff ff ff 00 00 b5 0f 81 88 ff ff ................
backtrace:
[<ffffffff83a8c59b>] kmalloc include/linux/slab.h:600 [inline]
[<ffffffff83a8c59b>] nft_netdev_hook_alloc+0x3b/0xc0 net/netfilter/nf_tables_api.c:1901
[<ffffffff83a9239a>] nft_chain_parse_netdev net/netfilter/nf_tables_api.c:1998 [inline]
[<ffffffff83a9239a>] nft_chain_parse_hook+0x33a/0x530 net/netfilter/nf_tables_api.c:2073
[<ffffffff83a9b14b>] nf_tables_addchain.constprop.0+0x10b/0x950 net/netfilter/nf_tables_api.c:2218
[<ffffffff83a9c41b>] nf_tables_newchain+0xa8b/0xc60 net/netfilter/nf_tables_api.c:2593
[<ffffffff83a3d6a6>] nfnetlink_rcv_batch+0xa46/0xd20 net/netfilter/nfnetlink.c:517
[<ffffffff83a3db79>] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:638 [inline]
[<ffffffff83a3db79>] nfnetlink_rcv+0x1f9/0x220 net/netfilter/nfnetlink.c:656
[<ffffffff83a13b17>] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
[<ffffffff83a13b17>] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345
[<ffffffff83a13fd6>] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921
[<ffffffff83865ab6>] sock_sendmsg_nosec net/socket.c:714 [inline]
[<ffffffff83865ab6>] sock_sendmsg+0x56/0x80 net/socket.c:734
[<ffffffff8386601c>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2482
[<ffffffff8386a918>] ___sys_sendmsg+0xa8/0x110 net/socket.c:2536
[<ffffffff8386aaa8>] __sys_sendmsg+0x88/0x100 net/socket.c:2565
[<ffffffff845e5955>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
[<ffffffff845e5955>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
[<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
Fixes: d54725cd11a5 ("netfilter: nf_tables: support for multiple devices per netdev hook")
Reported-by: syzbot+5fcdbfab6d6744c57418@syzkaller•appspotmail.com
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter•org>
---
net/netfilter/nf_tables_api.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 2ee50e23c9b7..816052089b33 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2166,8 +2166,10 @@ static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
chain->flags |= NFT_CHAIN_BASE | flags;
basechain->policy = NF_ACCEPT;
if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
- !nft_chain_offload_support(basechain))
+ !nft_chain_offload_support(basechain)) {
+ list_splice_init(&basechain->hook_list, &hook->list);
return -EOPNOTSUPP;
+ }
flow_block_init(&basechain->flow_block);
--
2.35.1
next prev parent reply other threads:[~2022-09-01 7:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-01 7:12 [PATCH net 0/4] netfilter: bug fixes for net Florian Westphal
2022-09-01 7:12 ` [PATCH net 1/4] netfilter: remove nf_conntrack_helper sysctl and modparam toggles Florian Westphal
2022-09-02 4:07 ` Jakub Kicinski
2022-09-02 5:39 ` Florian Westphal
2022-09-03 2:43 ` Jakub Kicinski
2022-09-03 4:20 ` patchwork-bot+netdevbpf
2022-09-01 7:12 ` [PATCH net 2/4] netfilter: br_netfilter: Drop dst references before setting Florian Westphal
2022-09-01 7:12 ` Florian Westphal [this message]
2022-09-01 7:12 ` [PATCH net 4/4] netfilter: nf_conntrack_irc: Fix forged IP logic Florian Westphal
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