From patchwork Wed Aug 16 14:19:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13355254 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 aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73666C04A6A for ; Wed, 16 Aug 2023 14:20:59 +0000 (UTC) Received: from relmlie5.idc.renesas.com (relmlie5.idc.renesas.com [210.160.252.171]) by mx.groups.io with SMTP id smtpd.web10.162042.1692195642925975488 for ; Wed, 16 Aug 2023 07:20:49 -0700 Authentication-Results: mx.groups.io; dkim=none (message not signed); spf=pass (domain: bp.renesas.com, ip: 210.160.252.171, mailfrom: biju.das.jz@bp.renesas.com) X-IronPort-AV: E=Sophos;i="6.01,177,1684767600"; d="scan'208";a="173100210" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 16 Aug 2023 23:20:49 +0900 Received: from localhost.localdomain (unknown [10.226.92.162]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 699CC4210C24; Wed, 16 Aug 2023 23:20:47 +0900 (JST) From: Biju Das To: cip-dev@lists.cip-project.org, Nobuhiro Iwamatsu , Pavel Machek Cc: Biju Das , Claudiu Beznea Subject: [PATCH 5.10.y-cip 11/31] rtc: fix RTC removal Date: Wed, 16 Aug 2023 15:19:57 +0100 Message-Id: <20230816142017.147173-12-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230816142017.147173-1-biju.das.jz@bp.renesas.com> References: <20230816142017.147173-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 List-Id: X-Webhook-Received: from li982-79.members.linode.com [45.33.32.79] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Wed, 16 Aug 2023 14:20:59 -0000 X-Groupsio-URL: https://lists.cip-project.org/g/cip-dev/message/12693 From: Alexandre Belloni commit f70cc33029fca3cf62bffb15102ea42eb4d097ac upstream. Since the rtc_register_device, removing an RTC device will end with a refcount_t: underflow; use-after-free warning since put_device is called twice in the device tear down path. Fixes: fdcfd854333b ("rtc: rework rtc_register_device() resource management") Signed-off-by: Alexandre Belloni Reviewed-by: Bartosz Golaszewski Link: https://lore.kernel.org/r/20201205231449.610980-1-alexandre.belloni@bootlin.com Signed-off-by: Biju Das --- drivers/rtc/class.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 5a1de9078ae6..34ee17019895 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -344,7 +344,6 @@ static void devm_rtc_unregister_device(void *data) cdev_device_del(&rtc->char_dev, &rtc->dev); rtc->ops = NULL; mutex_unlock(&rtc->ops_lock); - put_device(&rtc->dev); } static void devm_rtc_release_device(void *res)