From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38FB0C33C9E for ; Sat, 11 Jan 2020 10:10:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0319D2082E for ; Sat, 11 Jan 2020 10:10:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737402; bh=CML4ynmYXN0xB1zt3WrGElGGQONxilXaUfFuXX/uags=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ROoF5Y3976p6xGlXBSwf1gkmraO0uIzSrLYK1wMn90A5nsghZ/mcR2bPfBUvRNwko n/QxgxgyiEiDWAfaLdEVO06LX1BoXJXshaQuz8Z2bfg2BwiS1oSOLMQ5pSscbCeUah Yj5t91dI4m7FS9RtWeLkwKhnV2QlSCHN3zusHj9I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729811AbgAKKKA (ORCPT ); Sat, 11 Jan 2020 05:10:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:46242 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728812AbgAKKJ7 (ORCPT ); Sat, 11 Jan 2020 05:09:59 -0500 Received: from localhost (unknown [62.119.166.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B0909206DA; Sat, 11 Jan 2020 10:09:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737398; bh=CML4ynmYXN0xB1zt3WrGElGGQONxilXaUfFuXX/uags=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DNRICSqx/DIDrU6yEBbdsSu+13x9uJ5G1EB/uyNtUNxWV090NwlS2if9e5y6DKUxS eC6coha6BelQf75pPzCZ3cpZTWny3dpx4G97v4fITHLcxvGfX0WYsfAy+y6W+9bzFc kQUjpxxYNUHYBWRFaZ5eqluB57/2qQdIeVHRUnQ4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thomas Hebb , Masahiro Yamada , Sasha Levin Subject: [PATCH 4.14 29/62] kconfig: dont crash on NULL expressions in expr_eq() Date: Sat, 11 Jan 2020 10:50:11 +0100 Message-Id: <20200111094845.355175397@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200111094837.425430968@linuxfoundation.org> References: <20200111094837.425430968@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Hebb [ Upstream commit 272a72103012862e3a24ea06635253ead0b6e808 ] NULL expressions are taken to always be true, as implemented by the expr_is_yes() macro and by several other functions in expr.c. As such, they ought to be valid inputs to expr_eq(), which compares two expressions. Signed-off-by: Thomas Hebb Signed-off-by: Masahiro Yamada Signed-off-by: Sasha Levin --- scripts/kconfig/expr.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c index ed29bad1f03a..96420b620963 100644 --- a/scripts/kconfig/expr.c +++ b/scripts/kconfig/expr.c @@ -201,6 +201,13 @@ static int expr_eq(struct expr *e1, struct expr *e2) { int res, old_count; + /* + * A NULL expr is taken to be yes, but there's also a different way to + * represent yes. expr_is_yes() checks for either representation. + */ + if (!e1 || !e2) + return expr_is_yes(e1) && expr_is_yes(e2); + if (e1->type != e2->type) return 0; switch (e1->type) { -- 2.20.1