llc: fix info leak via getsockname()

commit 3592aaeb80290bda0f2cf0b5456c97bfc638b192 upstream.

The LLC code wrongly returns 0, i.e. "success", when the socket is
zapped. Together with the uninitialized uaddrlen pointer argument from
sys_getsockname this leads to an arbitrary memory leak of up to 128
bytes kernel stack via the getsockname() syscall.

Return an error instead when the socket is zapped to prevent the info
leak. Also remove the unnecessary memset(0). We don't directly write to
the memory pointed by uaddr but memcpy() a local structure at the end of
the function that is properly initialized.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index ad4296c852ebc5b468f01b2ef378a40f81bbf9a9..06010e1e89f9a1316f3e2a9a37febaeeb65db6da 100644 (file)
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -959,14 +959,13 @@ static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
        struct sockaddr_llc sllc;
        struct sock *sk = sock->sk;
        struct llc_sock *llc = llc_sk(sk);
-       int rc = 0;
+       int rc = -EBADF;
 
        memset(&sllc, 0, sizeof(sllc));
        lock_sock(sk);
        if (sock_flag(sk, SOCK_ZAPPED))
                goto out;
        *uaddrlen = sizeof(sllc);
-       memset(uaddr, 0, *uaddrlen);
        if (peer) {
                rc = -ENOTCONN;
                if (sk->sk_state != TCP_ESTABLISHED)