AppArmor: fix oops in apparmor_setprocattr

When invalid parameters are passed to apparmor_setprocattr a NULL deref
oops occurs when it tries to record an audit message. This is because
it is passing NULL for the profile parameter for aa_audit. But aa_audit
now requires that the profile passed is not NULL.

Fix this by passing the current profile on the task that is trying to
setprocattr.

Signed-off-by: Kees Cook <kees@ubuntu.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Cc: stable@kernel.org
Signed-off-by: James Morris <jmorris@namei.org>
static int common_perm(int op, struct path *path, u32 mask,
		       struct path_cond *cond)
{
	struct aa_profile *profile;
	int error = 0;

	profile = __aa_current_profile();
	if (!unconfined(profile))
		error = aa_path_perm(op, profile, path, 0, mask, cond);

	return error;
}

static int common_perm(int op, struct path *path, u32 mask,
		       struct path_cond *cond)
{
	struct aa_profile *profile;
	int error = 0;

	profile = __aa_current_profile();
	if (!unconfined(profile))
		error = aa_path_perm(op, profile, path, 0, mask, cond);

	return error;
}
