linux-kernel - [PATCH 3.4 076/107] pptp: verify sockaddr_len in pptp_bind() and pptp

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Message-Id: <1458115601-5762-76-git-send-email-lizf@kernel.org>
Date:	Wed, 16 Mar 2016 16:06:10 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, WANG Cong <xiyou.wangcong@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 076/107] pptp: verify sockaddr_len in pptp_bind() and pptp_connect()

From: WANG Cong <xiyou.wangcong@...il.com>

3.4.111-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 09ccfd238e5a0e670d8178cf50180ea81ae09ae1 upstream.

Reported-by: Dmitry Vyukov <dvyukov@...il.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/net/ppp/pptp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c
index 9f047a0..5a13ad0 100644
--- 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;
 
-- 
1.9.1