Reported-by: Dmitry Vyukov <dvyu...@gmail.com>
Signed-off-by: Hannes Frederic Sowa <han...@stressinduktion.org>
---
 drivers/net/ppp/pptp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c
index fc69e41d09506e..f9ffdf070ad807 100644
--- a/drivers/net/ppp/pptp.c
+++ b/drivers/net/ppp/pptp.c
@@ -419,6 +419,9 @@ static int pptp_bind(struct socket *sock, struct sockaddr 
*uservaddr,
        struct pptp_opt *opt = &po->proto.pptp;
        int error = 0;
 
+       if (sockaddr_len < sizeof(*sp))
+               return -EINVAL;
+
        lock_sock(sk);
 
        opt->src_addr = sp->sa_addr.pptp;
-- 
2.5.0

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