From nobody Fri Dec 19 05:27:23 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A9A0C25B0E for ; Mon, 15 Aug 2022 18:40:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242049AbiHOSkQ (ORCPT ); Mon, 15 Aug 2022 14:40:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240822AbiHOSjO (ORCPT ); Mon, 15 Aug 2022 14:39:14 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B9B82ED4B; Mon, 15 Aug 2022 11:23:55 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 43F5360FA3; Mon, 15 Aug 2022 18:23:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E031C433C1; Mon, 15 Aug 2022 18:23:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660587833; bh=G2wKVs2hxomJLfCHleVjEq03UftGpFfhnCPiTRRTtEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jk5ECl1GYkZOgqQqeAqUb3Y+A5s5NgKRVcOvfHU0oRwQOGGcBnPiDMscXTqmbYBHP rDVJWxHC+gWLm0oeqcdAyJTcwcqDAcsAFFcVcHu8a5+BlS/XJp94wcGBZlc2Vjz76w zlhmg0+sbnEu30z44lXQ2mTUEOeW73dO6UNGLMas= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yang Yingliang , Conor Dooley , Mark Brown , Sasha Levin Subject: [PATCH 5.15 209/779] spi: Fix simplification of devm_spi_register_controller Date: Mon, 15 Aug 2022 19:57:33 +0200 Message-Id: <20220815180346.204631619@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180337.130757997@linuxfoundation.org> References: <20220815180337.130757997@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Yang Yingliang [ Upstream commit 43cc5a0afe4184a7fafe1eba32b5a11bb69c9ce0 ] This reverts commit 59ebbe40fb51 ("spi: simplify devm_spi_register_controller"). If devm_add_action() fails in devm_add_action_or_reset(), devm_spi_unregister() will be called, it decreases the refcount of 'ctlr->dev' to 0, then it will cause uaf in the drivers that calling spi_put_controller() in error path. Fixes: 59ebbe40fb51 ("spi: simplify devm_spi_register_controller") Signed-off-by: Yang Yingliang Reviewed-by: Conor Dooley Link: https://lore.kernel.org/r/20220712135504.1055688-1-yangyingliang@huaw= ei.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index d0bbf8f9414d..556d65af5e23 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2949,9 +2949,9 @@ int spi_register_controller(struct spi_controller *ct= lr) } EXPORT_SYMBOL_GPL(spi_register_controller); =20 -static void devm_spi_unregister(void *ctlr) +static void devm_spi_unregister(struct device *dev, void *res) { - spi_unregister_controller(ctlr); + spi_unregister_controller(*(struct spi_controller **)res); } =20 /** @@ -2970,13 +2970,22 @@ static void devm_spi_unregister(void *ctlr) int devm_spi_register_controller(struct device *dev, struct spi_controller *ctlr) { + struct spi_controller **ptr; int ret; =20 + ptr =3D devres_alloc(devm_spi_unregister, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + ret =3D spi_register_controller(ctlr); - if (ret) - return ret; + if (!ret) { + *ptr =3D ctlr; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } =20 - return devm_add_action_or_reset(dev, devm_spi_unregister, ctlr); + return ret; } EXPORT_SYMBOL_GPL(devm_spi_register_controller); =20 --=20 2.35.1