From: Peilin Ye <yepeilin.cs@gmail.com>
To: Wensong Zhang <wensong@linux-vs.org>,
Simon Horman <horms@verge.net.au>, Julian Anastasov <ja@ssi.bg>
Cc: coreteam@netfilter.org, Florian Westphal <fw@strlen.de>,
linux-kernel@vger.kernel.org, Peilin Ye <yepeilin.cs@gmail.com>,
lvs-devel@vger.kernel.org, netdev@vger.kernel.org,
netfilter-devel@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,
Cong Wang <xiyou.wangcong@gmail.com>,
syzkaller-bugs@googlegroups.com,
Jozsef Kadlecsik <kadlec@netfilter.org>,
linux-kernel-mentees@lists.linuxfoundation.org,
"David S. Miller" <davem@davemloft.net>,
Pablo Neira Ayuso <pablo@netfilter.org>
Subject: [Linux-kernel-mentees] [PATCH net-next v2] ipvs: Fix uninit-value in do_ip_vs_set_ctl()
Date: Tue, 11 Aug 2020 03:46:40 -0400 [thread overview]
Message-ID: <20200811074640.841693-1-yepeilin.cs@gmail.com> (raw)
In-Reply-To: <20200810220703.796718-1-yepeilin.cs@gmail.com>
do_ip_vs_set_ctl() is referencing uninitialized stack value when `len` is
zero. Fix it.
Reported-by: syzbot+23b5f9e7caf61d9a3898@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=46ebfb92a8a812621a001ef04d90dfa459520fe2
Suggested-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
---
Changes in v2:
- Target net-next tree. (Suggested by Julian Anastasov <ja@ssi.bg>)
- Reject all `len == 0` requests except `IP_VS_SO_SET_FLUSH`, instead
of initializing `arg`. (Suggested by Cong Wang
<xiyou.wangcong@gmail.com>, Julian Anastasov <ja@ssi.bg>)
net/netfilter/ipvs/ip_vs_ctl.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 412656c34f20..beeafa42aad7 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2471,6 +2471,10 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
/* Set timeout values for (tcp tcpfin udp) */
ret = ip_vs_set_timeout(ipvs, (struct ip_vs_timeout_user *)arg);
goto out_unlock;
+ } else if (!len) {
+ /* No more commands with len == 0 below */
+ ret = -EINVAL;
+ goto out_unlock;
}
usvc_compat = (struct ip_vs_service_user *)arg;
@@ -2547,9 +2551,6 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
break;
case IP_VS_SO_SET_DELDEST:
ret = ip_vs_del_dest(svc, &udest);
- break;
- default:
- ret = -EINVAL;
}
out_unlock:
--
2.25.1
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next prev parent reply other threads:[~2020-08-11 7:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-10 22:07 [Linux-kernel-mentees] [PATCH net] ipvs: Fix uninit-value in do_ip_vs_set_ctl() Peilin Ye
2020-08-11 3:57 ` Cong Wang
2020-08-11 5:09 ` Peilin Ye
2020-08-11 6:58 ` Julian Anastasov
2020-08-11 7:19 ` Peilin Ye
2020-08-11 7:46 ` Peilin Ye [this message]
2020-08-11 10:29 ` [Linux-kernel-mentees] [PATCH net-next v2] " Julian Anastasov
2020-08-11 12:59 ` Simon Horman
2020-08-13 1:28 ` Pablo Neira Ayuso
2020-08-28 17:21 ` Pablo Neira Ayuso
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