From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mathias Krause , "David S. Miller" Subject: [ 05/42] atm: update msg_namelen in vcc_recvmsg() Date: Mon, 29 Apr 2013 12:01:47 -0700 Message-Id: <20130429184753.004084085@linuxfoundation.org> In-Reply-To: <20130429184752.435249613@linuxfoundation.org> References: <20130429184752.435249613@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Krause [ Upstream commit 9b3e617f3df53822345a8573b6d358f6b9e5ed87 ] The current code does not fill the msg_name member in case it is set. It also does not set the msg_namelen member to 0 and therefore makes net/socket.c leak the local, uninitialized sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Fix that by simply setting msg_namelen to 0 as obviously nobody cared about vcc_recvmsg() not filling the msg_name in case it was set. Signed-off-by: Mathias Krause Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/atm/common.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/atm/common.c +++ b/net/atm/common.c @@ -532,6 +532,8 @@ int vcc_recvmsg(struct kiocb *iocb, stru struct sk_buff *skb; int copied, error = -EINVAL; + msg->msg_namelen = 0; + if (sock->state != SS_CONNECTED) return -ENOTCONN;