netrom: fix invalid use of sizeof in nr_recvmsg()

[ Upstream commit c802d759623acbd6e1ee9fbdabae89159a513913 ]

sizeof() when applied to a pointer typed expression gives the size of the
pointer, not that of the pointed data.
Introduced by commit 3ce5ef(netrom: fix info leak via msg_name in nr_recvmsg)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 72cad6cbcbce532046202404562aecb003f5b478..7ed9b1d0c102cd0e0aae3f0b6755a6c8d7765ffd 100644 (file)
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1177,7 +1177,7 @@ static int nr_recvmsg(struct kiocb *iocb, struct socket *sock,
        }
 
        if (sax != NULL) {
-               memset(sax, 0, sizeof(sax));
+               memset(sax, 0, sizeof(*sax));
                sax->sax25_family = AF_NETROM;
                skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
                              AX25_ADDR_LEN);