wext: fix potential private ioctl memory content leak

commit df6d0230 upstream.

When a driver doesn't fill the entire buffer, old
heap contents may remain, and if it also doesn't
update the length properly, this old heap content
will be copied back to userspace.

It is very unlikely that this happens in any of
the drivers using private ioctls since it would
show up as junk being reported by iwpriv, but it
seems better to be safe here, so use kzalloc.
Reported-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/wireless/wext.c

@@ -1029,7 +1029,7 @@ static int ioctl_private_iw_point(struct iw_point *iwp, unsigned int cmd,
 	} else if (!iwp->pointer)
 		return -EFAULT;
 
-	extra = kmalloc(extra_size, GFP_KERNEL);
+	extra = kzalloc(extra_size, GFP_KERNEL);
 	if (!extra)
 		return -ENOMEM;