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pptp: verify sockaddr_len in pptp_bind() and pptp_connect()
author
WANG Cong
<xiyou.wangcong@gmail.com>
Mon, 14 Dec 2015 21:48:36 +0000
(13:48 -0800)
committer
Ben Hutchings
<ben@decadent.org.uk>
Wed, 30 Dec 2015 02:26:03 +0000
(
02:26
+0000)
[ Upstream commit
09ccfd238e5a0e670d8178cf50180ea81ae09ae1
]
Reported-by: Dmitry Vyukov <dvyukov@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
drivers/net/ppp/pptp.c
patch
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diff --git
a/drivers/net/ppp/pptp.c
b/drivers/net/ppp/pptp.c
index
c974581
..
165ee14
100644
(file)
--- a/
drivers/net/ppp/pptp.c
+++ b/
drivers/net/ppp/pptp.c
@@
-420,6
+420,9
@@
static int pptp_bind(struct socket *sock, struct sockaddr *uservaddr,
struct pptp_opt *opt = &po->proto.pptp;
int error = 0;
+ if (sockaddr_len < sizeof(struct sockaddr_pppox))
+ return -EINVAL;
+
lock_sock(sk);
opt->src_addr = sp->sa_addr.pptp;
@@
-441,6
+444,9
@@
static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
struct flowi4 fl4;
int error = 0;
+ if (sockaddr_len < sizeof(struct sockaddr_pppox))
+ return -EINVAL;
+
if (sp->sa_protocol != PX_PROTO_PPTP)
return -EINVAL;