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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 F1C8DC433E0 for ; Mon, 8 Mar 2021 22:32:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C854465288 for ; Mon, 8 Mar 2021 22:32:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231701AbhCHWbf (ORCPT ); Mon, 8 Mar 2021 17:31:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231730AbhCHWbI (ORCPT ); Mon, 8 Mar 2021 17:31:08 -0500 Received: from mail-lf1-x135.google.com (mail-lf1-x135.google.com [IPv6:2a00:1450:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 64CFEC06174A for ; Mon, 8 Mar 2021 14:31:08 -0800 (PST) Received: by mail-lf1-x135.google.com with SMTP id p21so23629820lfu.11 for ; Mon, 08 Mar 2021 14:31:08 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=mgVtVDJ4J9ZfP2mfzS736WoTsMup5fvgpbnXS5Fe3a8=; b=M+wVnP/KB8I6w466Y9xFPc5hUX+YdtfnLVnYCpM9Kp7Cw6dUrl6pRvJhajm5PjYBxT SfeJj6wvAM0tR+tYPY6aqBtQ9MxgQZHO5ph34MNOveLyXa+aSY2yvVB8XBLGg95SJdmI iVyIZB5ajJ/CNZkE8Pcvcv8bSsk8vtURxkpCGi7DFoKCcB54czUnVA3+sIAKdxQkWjR/ FBewIzUOuhD98dNY9UMPnWC4aCfcIGj+krz6tT7KLwvwsMAnUd1halJIn32yvhAHPRqd UvNETUESRmdktnLcZkEHNZ2SShn+E4gmRb5M/TJ9OEA+FUWmqBG+x+UqoV2q07fcnxVR /UeA== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=mgVtVDJ4J9ZfP2mfzS736WoTsMup5fvgpbnXS5Fe3a8=; b=kfDzXov4+BsZOHPvuP47LlJqS0vup9xg4y5mZIvqhazUSpOzLPmedSYgIlXoAGJUzn 4AQCy4FRy0f8GXmHFMPQc2ONCP/0ck7nqbw2QdeZ1j+w0MqIE1PJ0mW+kvQtqpzd/aVp +Y+/y4xFDBR++7yo9ONEe+tjJbCC00TimKphr7zK+ocjWn6lnBzXykUdYnuGa8SVUN+w tsVlY2i+q17covKxubf5S5IDL9xk2l1zdHnnjlasPI4IlFfTimq7HfCoHr7hPHPy2Z9z b3IWuFh54zSYPnnfvPanLM/M0EYtqNR3bJo9RuEMNIB0AK/u10YO99tnB+iOTI26hAgk RN/g== X-Gm-Message-State: AOAM532ap+XESjhDI7jrfpBDEu8UYQJuvaxUiGVdS13OMdRslPikw6Ur QLYZfTiYwEk+GQAw4njld40= X-Google-Smtp-Source: ABdhPJyI2CGVBw+yoGGPeeq2F338VAm8dTNAgH2Rp77EGChXVrzx4AfEj/iTJrw9Uv3K00xIkYVeMA== X-Received: by 2002:a19:ef02:: with SMTP id n2mr14976923lfh.141.1615242666898; Mon, 08 Mar 2021 14:31:06 -0800 (PST) Received: from localhost.localdomain ([94.103.235.167]) by smtp.gmail.com with ESMTPSA id p13sm1653426ljg.116.2021.03.08.14.31.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Mar 2021 14:31:06 -0800 (PST) From: Pavel Skripkin To: perex@perex.cz, tiwai@suse.com, kai.heng.feng@canonical.com Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, Pavel Skripkin Subject: [PATCH next 2/2] sound: usb: fix use after free in usb_audio_disconnect Date: Tue, 9 Mar 2021 01:30:57 +0300 Message-Id: <16da19126ff461e5e64a9aec648cce28fb8ed73e.1615242183.git.paskripkin@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The problem was in wrong "if" placement. chip->quirk_type is freed in snd_card_free_when_closed(), but inside if statement it's accesed. Fixes: 9799110825db ("ALSA: usb-audio: Disable USB autosuspend properly in setup_disable_autosuspend()" Signed-off-by: Pavel Skripkin --- sound/usb/card.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sound/usb/card.c b/sound/usb/card.c index 3fd1743513b5..b6f4c0848e66 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -907,6 +907,9 @@ static void usb_audio_disconnect(struct usb_interface *intf) } } + if (chip->quirk_type & QUIRK_SETUP_DISABLE_AUTOSUSPEND) + usb_enable_autosuspend(interface_to_usbdev(intf)); + chip->num_interfaces--; if (chip->num_interfaces <= 0) { usb_chip[chip->index] = NULL; @@ -915,9 +918,6 @@ static void usb_audio_disconnect(struct usb_interface *intf) } else { mutex_unlock(®ister_mutex); } - - if (chip->quirk_type & QUIRK_SETUP_DISABLE_AUTOSUSPEND) - usb_enable_autosuspend(interface_to_usbdev(intf)); } /* lock the shutdown (disconnect) task and autoresume */ -- 2.25.1