From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 1/7] netfilter: nft_osf: add missing check for DREG attribute
Date: Sat, 25 Jan 2020 18:34:09 +0100 [thread overview]
Message-ID: <20200125173415.191571-2-pablo@netfilter.org> (raw)
In-Reply-To: <20200125173415.191571-1-pablo@netfilter.org>
From: Florian Westphal <fw@strlen.de>
syzbot reports just another NULL deref crash because of missing test
for presence of the attribute.
Reported-by: syzbot+cf23983d697c26c34f60@syzkaller.appspotmail.com
Fixes: b96af92d6eaf9fadd ("netfilter: nf_tables: implement Passive OS fingerprint module in nft_osf")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nft_osf.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/netfilter/nft_osf.c b/net/netfilter/nft_osf.c
index f54d6ae15bb1..b42247aa48a9 100644
--- a/net/netfilter/nft_osf.c
+++ b/net/netfilter/nft_osf.c
@@ -61,6 +61,9 @@ static int nft_osf_init(const struct nft_ctx *ctx,
int err;
u8 ttl;
+ if (!tb[NFTA_OSF_DREG])
+ return -EINVAL;
+
if (tb[NFTA_OSF_TTL]) {
ttl = nla_get_u8(tb[NFTA_OSF_TTL]);
if (ttl > 2)
--
2.11.0
next prev parent reply other threads:[~2020-01-25 17:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-25 17:34 [PATCH 0/7] Netfilter fixes for net Pablo Neira Ayuso
2020-01-25 17:34 ` Pablo Neira Ayuso [this message]
2020-01-25 17:34 ` [PATCH 2/7] netfilter: ipset: use bitmap infrastructure completely Pablo Neira Ayuso
2020-01-25 17:34 ` [PATCH 3/7] netfilter: conntrack: sctp: use distinct states for new SCTP connections Pablo Neira Ayuso
2020-01-25 17:34 ` [PATCH 4/7] netfilter: nf_tables_offload: fix check the chain offload flag Pablo Neira Ayuso
2020-01-25 17:34 ` [PATCH 5/7] netfilter: nf_tables: add __nft_chain_type_get() Pablo Neira Ayuso
2020-01-25 17:34 ` [PATCH 6/7] netfilter: nf_tables: autoload modules from the abort path Pablo Neira Ayuso
2020-01-25 17:34 ` [PATCH 7/7] net: Fix skb->csum update in inet_proto_csum_replace16() Pablo Neira Ayuso
2020-01-25 20:40 ` [PATCH 0/7] Netfilter fixes for net David Miller
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