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=-9.5 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 987B5C00523 for ; Mon, 6 Jan 2020 01:49:47 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AA3FA21734 for ; Mon, 6 Jan 2020 01:49:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="NYWld2IS"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nWysjDEF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AA3FA21734 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 7C38F17F9; Mon, 6 Jan 2020 02:48:54 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 7C38F17F9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1578275384; bh=44+acSH2A7K85wWCq3JbaHGIasij7q7AdF61Dd04wiA=; h=From:To:Date:Cc:Subject:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:From; b=NYWld2ISarwb614m7Ycp49SzXxB6lgGc7KWIusQvZHtZ7FE+wPXMNa+8SgwFelCnV 9MFLpfGkN12VIgAVr6efabKil2ezUWpbdV2W8Mr3y1R05MK3c3Q/V3dxwhBXvTl7A9 +AHiZQagCCOhhtUvIIvBvUMT4mU7hS8a4jxHBewY= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id F3F90F8010D; Mon, 6 Jan 2020 02:48:53 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 4B12EF8014A; Mon, 6 Jan 2020 02:48:52 +0100 (CET) Received: from mail-lj1-x242.google.com (mail-lj1-x242.google.com [IPv6:2a00:1450:4864:20::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 5F4DCF8010D for ; Mon, 6 Jan 2020 02:48:48 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 5F4DCF8010D Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nWysjDEF" Received: by mail-lj1-x242.google.com with SMTP id y6so41311765lji.0 for ; Sun, 05 Jan 2020 17:48:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=iEBeBtX3D+FecxXDkPEiiIV4CkPQmZtOza+gbuFwJ6Q=; b=nWysjDEFnf1ZW1KuOOtMZR3c8DXFeGoQ7Pkf0QqGQyTgGE4bUjSsvLIglzOM/Embgd +G/Wy46pZx7Mh4lJuIHmrT7Yr/AiDzSHQDCLmJpFSasUdy0CEB8/PDY714n2OX2aP0Jk TBjnXkgFulCTksMF+sROlNYzGwjAChVcXgLAsAHgIPR0p1fjlSOtnvsf0JynHxVR9lqU zUbb7fGzTbZcchQ4XvAn+5JE+v1ffZ/QuhG6Qfec7SmR99EZs4oT8Fcne5abr6jGWham H2pG9P92gUI3yDMgt5GUJWxbYH8BMMZCJHo1vZPgZ5727Sjc6Kw7VuMDwPrsq86VyNNd FIzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=iEBeBtX3D+FecxXDkPEiiIV4CkPQmZtOza+gbuFwJ6Q=; b=rXSW0tHXwWpAJl1Dbhx2JxX1af6I7P4c3K9TMsAXVAtAvEGiUpz/SprEoKD+WphW6B AVmY9St9WXZUhLvXWYbOIp5FRpC9+dozGBQsnvgLOZ6LC3CTM+hzMJ1MyBxlOIdET4q7 3YnMJkMIEI3ZYj128wPbwEeLATb+h/LYJjGUHBxYDWxXq3DsP2HXzZsTBrZXLHAt3x1y 5OpoCHASPMbCEmXJzdeGYnPb8Y5zOU5yo3mPjpKsZbiHeeS1YLJZZv3GZn96jpNA0hqe 0wN+5wXwTmcgf186Y2XW+ZpMqCvkPVPr0sabgGwrneQlSoZMndY6JfN01mqVtGONM45X JkMQ== X-Gm-Message-State: APjAAAUAEwQnWPLWKRp7Jj9QABBpu2DHPlSSG9KxI4EiqQHWbuZ/2rzC UX8hCzyTNX7xrVNP3AOxm5A= X-Google-Smtp-Source: APXvYqwDJIKUFFtDFfKjMDK2pI9tL+4EGshl7DCfCiqzjicOIBaD27gA1g1LXj+YNFMyhi1mP5VFYg== X-Received: by 2002:a2e:9a01:: with SMTP id o1mr56311153lji.247.1578275327908; Sun, 05 Jan 2020 17:48:47 -0800 (PST) Received: from localhost.localdomain (79-139-233-37.dynamic.spd-mgts.ru. [79.139.233.37]) by smtp.gmail.com with ESMTPSA id e17sm28369857ljg.101.2020.01.05.17.48.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Jan 2020 17:48:47 -0800 (PST) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Mark Brown , Jaroslav Kysela , Bard Liao , Oder Chiou , Liam Girdwood , Takashi Iwai Date: Mon, 6 Jan 2020 04:47:07 +0300 Message-Id: <20200106014707.11378-1-digetx@gmail.com> X-Mailer: git-send-email 2.24.0 MIME-Version: 1.0 Cc: linux-tegra@vger.kernel.org, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: [alsa-devel] [PATCH v2] ASoC: rt5640: Fix NULL dereference on module unload X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" The rt5640->jack is NULL if jack is already disabled at the time of driver's module unloading. Signed-off-by: Dmitry Osipenko --- Changelog: v2: - Addressed review comment from Takashi Iwai by making patch's diff a bit cleaner and simpler. - Addressed review comment from Mark Brown by removing noisy backtrace from the commit's message and moving it after --- in order to keep it discoverable in the ML archive. Backtrace: Unable to handle kernel NULL pointer dereference at virtual address 00000024 ... (rt5640_set_jack [snd_soc_rt5640]) (snd_soc_component_set_jack [snd_soc_core]) (soc_remove_component [snd_soc_core]) (soc_cleanup_card_resources [snd_soc_core]) (snd_soc_unregister_card [snd_soc_core]) (tegra_rt5640_remove [snd_soc_tegra_rt5640]) (platform_drv_remove) (device_release_driver_internal) (driver_detach) (bus_remove_driver) (tegra_rt5640_driver_exit (sys_delete_module) sound/soc/codecs/rt5640.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c index adbae1f36a8a..747ca248bf10 100644 --- a/sound/soc/codecs/rt5640.c +++ b/sound/soc/codecs/rt5640.c @@ -2432,6 +2432,13 @@ static void rt5640_disable_jack_detect(struct snd_soc_component *component) { struct rt5640_priv *rt5640 = snd_soc_component_get_drvdata(component); + /* + * soc_remove_component() force-disables jack and thus rt5640->jack + * could be NULL at the time of driver's module unloading. + */ + if (!rt5640->jack) + return; + disable_irq(rt5640->irq); rt5640_cancel_work(rt5640); -- 2.24.0 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel