[NET]: fix uaccess handling

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index d56e0d21f91..d527c8977b1 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1075,8 +1075,9 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
                         return -EINVAL;
                 len = sizeof(int);
                 val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0;
-                put_user(len, optlen);
-                put_user(val, optval);
+                if (put_user(len, optlen) ||
+                    put_user(val, optval))
+                        return -EFAULT;
                 err = 0;
                 break;
         default: