[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20200811074640.841693-1-yepeilin.cs@gmail.com>
Date: Tue, 11 Aug 2020 03:46:40 -0400
From: Peilin Ye <yepeilin.cs@...il.com>
To: Wensong Zhang <wensong@...ux-vs.org>,
Simon Horman <horms@...ge.net.au>, Julian Anastasov <ja@....bg>
Cc: Peilin Ye <yepeilin.cs@...il.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
netdev@...r.kernel.org, lvs-devel@...r.kernel.org,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
linux-kernel-mentees@...ts.linuxfoundation.org,
syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [Linux-kernel-mentees] [PATCH net-next v2] ipvs: Fix uninit-value in do_ip_vs_set_ctl()
do_ip_vs_set_ctl() is referencing uninitialized stack value when `len` is
zero. Fix it.
Reported-by: syzbot+23b5f9e7caf61d9a3898@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=46ebfb92a8a812621a001ef04d90dfa459520fe2
Suggested-by: Julian Anastasov <ja@....bg>
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
Changes in v2:
- Target net-next tree. (Suggested by Julian Anastasov <ja@....bg>)
- Reject all `len == 0` requests except `IP_VS_SO_SET_FLUSH`, instead
of initializing `arg`. (Suggested by Cong Wang
<xiyou.wangcong@...il.com>, Julian Anastasov <ja@....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
Powered by blists - more mailing lists