From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF6D77B for ; Wed, 23 Nov 2022 08:59:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1B06BC433D7; Wed, 23 Nov 2022 08:59:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669193981; bh=aUJhFyHohN20NlAGcixCwR5yZZi0/oiXnIScYpqYowk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KJXzPYuERf+vQOr9tOPm3f/NJsAPnRUTbfKF82WX4HUOga0cVHXBluyxVQurc7gb2 I8xAgcbgBlev7fUD4myV7eM8nJ4NhZZHs2yeBUIW4GRc6jeNb8+lRDGnI1DIo8IG7S 9hwLFL1wJptKGrLv316Tk3e1XehohlanI9oo4EA0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chen Zhongjin , Mark Brown , Sasha Levin Subject: [PATCH 4.14 37/88] ASoC: core: Fix use-after-free in snd_soc_exit() Date: Wed, 23 Nov 2022 09:50:34 +0100 Message-Id: <20221123084549.785407816@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221123084548.535439312@linuxfoundation.org> References: <20221123084548.535439312@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Chen Zhongjin [ Upstream commit 6ec27c53886c8963729885bcf2dd996eba2767a7 ] KASAN reports a use-after-free: BUG: KASAN: use-after-free in device_del+0xb5b/0xc60 Read of size 8 at addr ffff888008655050 by task rmmod/387 CPU: 2 PID: 387 Comm: rmmod Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Call Trace: dump_stack_lvl+0x79/0x9a print_report+0x17f/0x47b kasan_report+0xbb/0xf0 device_del+0xb5b/0xc60 platform_device_del.part.0+0x24/0x200 platform_device_unregister+0x2e/0x40 snd_soc_exit+0xa/0x22 [snd_soc_core] __do_sys_delete_module.constprop.0+0x34f/0x5b0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd ... It's bacause in snd_soc_init(), snd_soc_util_init() is possble to fail, but its ret is ignored, which makes soc_dummy_dev unregistered twice. snd_soc_init() snd_soc_util_init() platform_device_register_simple(soc_dummy_dev) platform_driver_register() # fail platform_device_unregister(soc_dummy_dev) platform_driver_register() # success ... snd_soc_exit() snd_soc_util_exit() # soc_dummy_dev will be unregistered for second time To fix it, handle error and stop snd_soc_init() when util_init() fail. Also clean debugfs when util_init() or driver_register() fail. Fixes: fb257897bf20 ("ASoC: Work around allmodconfig failure") Signed-off-by: Chen Zhongjin Link: https://lore.kernel.org/r/20221028031603.59416-1-chenzhongjin@huawei.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/soc-core.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index febf2b649b96..b29c5a09267e 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -4376,10 +4376,23 @@ EXPORT_SYMBOL_GPL(snd_soc_of_get_dai_link_codecs); static int __init snd_soc_init(void) { + int ret; + snd_soc_debugfs_init(); - snd_soc_util_init(); + ret = snd_soc_util_init(); + if (ret) + goto err_util_init; - return platform_driver_register(&soc_driver); + ret = platform_driver_register(&soc_driver); + if (ret) + goto err_register; + return 0; + +err_register: + snd_soc_util_exit(); +err_util_init: + snd_soc_debugfs_exit(); + return ret; } module_init(snd_soc_init); -- 2.35.1