hamradio/yam: fix info leak in ioctl

[ Upstream commit 8e3fbf870481eb53b2d3a322d1fc395ad8b367ed ]

The yam_ioctl() code fails to initialise the cmd field
of the struct yamdrv_ioctl_cfg. Add an explicit memset(0)
before filling the structure to avoid the 4-byte info leak.

Signed-off-by: Salva Peiró <speiro@ai2.upv.es>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 0721e72f9299250c6c29f0e1d3f7f51affffe7e8..82529a2658d73cb1c22e00232bbd9865508fb063 100644 (file)
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -1058,6 +1058,7 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
                break;
 
        case SIOCYAMGCFG:
+               memset(&yi, 0, sizeof(yi));
                yi.cfg.mask = 0xffffffff;
                yi.cfg.iobase = yp->iobase;
                yi.cfg.irq = yp->irq;