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    Subject[v2.6.34-stable 025/213] llc: Fix missing msg_namelen update in llc_ui_recvmsg()
    Date
    From: Mathias Krause <minipli@googlemail.com>

    -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
    -------------------

    commit c77a4b9cffb6215a15196ec499490d116dfad181 upstream.

    For stream sockets the code misses to update 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. The msg_namelen update is also missing for datagram sockets
    in case the socket is shutting down during receive.

    Fix both issues by setting msg_namelen to 0 early. It will be
    updated later if we're going to fill the msg_name member.

    Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
    Signed-off-by: Mathias Krause <minipli@googlemail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    net/llc/af_llc.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
    index 06010e1e89f9..121c92e3c128 100644
    --- a/net/llc/af_llc.c
    +++ b/net/llc/af_llc.c
    @@ -719,6 +719,8 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
    int target; /* Read at least this many bytes */
    long timeo;

    + msg->msg_namelen = 0;
    +
    lock_sock(sk);
    copied = -ENOTCONN;
    if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
    --
    1.8.5.2


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