net: ax25: fix information leak to userland harder

commit 5b919f833d9d60588d026ad82d17f17e8872c7a9 upstream.

Commit fe10ae53384e48c51996941b7720ee16995cbcb7 adds a memset() to clear
the structure being sent back to userspace, but accidentally used the
wrong size.

Reported-by: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Kees Cook <kees.cook@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 2ff5d33396e2881e0b6d2701c33906677be13eab..414439b949a24467449e96a0a3dd09230a1d0a20 100644 (file)
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1391,7 +1391,7 @@ static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
        ax25_cb *ax25;
        int err = 0;
 
-       memset(fsa, 0, sizeof(fsa));
+       memset(fsa, 0, sizeof(*fsa));
        lock_sock(sk);
        ax25 = ax25_sk(sk);