From patchwork Tue Mar 30 01:36:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuah Khan X-Patchwork-Id: 412211 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 87757C433E6 for ; Tue, 30 Mar 2021 01:37:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 601A961982 for ; Tue, 30 Mar 2021 01:37:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230338AbhC3BhD (ORCPT ); Mon, 29 Mar 2021 21:37:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230377AbhC3Bg4 (ORCPT ); Mon, 29 Mar 2021 21:36:56 -0400 Received: from mail-io1-xd2a.google.com (mail-io1-xd2a.google.com [IPv6:2607:f8b0:4864:20::d2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 333A5C061762 for ; Mon, 29 Mar 2021 18:36:56 -0700 (PDT) Received: by mail-io1-xd2a.google.com with SMTP id n21so14753405ioa.7 for ; Mon, 29 Mar 2021 18:36:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3F9Ll0qnSxDDddAOx0jqTjf+DiNaHm+WnTfsee7Z5qE=; b=STwWa5iIWBQnuXyByFcWblI5Yuw6ryaNi8aFcux+kT6rU8ycSq7bfx2bfmwAiUo3+T cexk4q1oE5HuSARupJhYrPx/AtOLP1mJN6950ZRCMzw34JX/fcKoRiXMebdNK+OdVdqX hkQq9E0x9ZwnkUfOjtAg+2yotMhjWoKEMoe+0= 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=3F9Ll0qnSxDDddAOx0jqTjf+DiNaHm+WnTfsee7Z5qE=; b=qkLJqHIPCsihuOHp09/r1ZxK5mOw5lfEcQEnCgesw1aZenOtv8Z6kzdiXcuH/ZKugy 3vpP4LCz5ExSlyfFmKSTv36cEs0/IBAty5G1ZknsxGQxRvE0NGr9hk5h0gR26mtwL5Pa YoBqOhdtYwSGOCe+CscZQdTk7ssTGszlx3V5KfWGrqldF6bu285ozDef7K5hEilBCWTz XylADMPU/GnkapltuIJmTATah/WG5BRH1v4EP1Jle64CKcOlcBs2d2AQ//QJwyWfgI3l 2fxkhBfM7EYMeuMAJgf20qxHgWQfu4i4VKh+V9FJ2If6Paqs4eLFrKDZFT5neQpq5whD IFyQ== X-Gm-Message-State: AOAM530IX/N/oDciT1c7xXh3X0Qlm7zVVy1cCRvfh3BV94W6XsSlXF4d Hrp8mCADbTx5l1dGNu6xsyjFAIlTl/EMAg== X-Google-Smtp-Source: ABdhPJxk7i3YAI4U7l+ZaD3kv7Ww8QwZ8r2xWDlq9TXLeehfGxAmiyDBUuENs49ZQjNY1w/c8/z1Cw== X-Received: by 2002:a5d:9250:: with SMTP id e16mr22642440iol.27.1617068215710; Mon, 29 Mar 2021 18:36:55 -0700 (PDT) Received: from shuah-t480s.internal (c-24-9-64-241.hsd1.co.comcast.net. [24.9.64.241]) by smtp.gmail.com with ESMTPSA id i13sm10551696ilm.86.2021.03.29.18.36.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Mar 2021 18:36:55 -0700 (PDT) From: Shuah Khan To: valentina.manea.m@gmail.com, shuah@kernel.org, gregkh@linuxfoundation.org Cc: Shuah Khan , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+a93fba6d384346a761e3@syzkaller.appspotmail.com, stable@vger.kernel.org Subject: [PATCH 4/4] usbip: synchronize event handler with sysfs code paths Date: Mon, 29 Mar 2021 19:36:51 -0600 Message-Id: X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Fuzzing uncovered race condition between sysfs code paths in usbip drivers. Device connect/disconnect code paths initiated through sysfs interface are prone to races if disconnect happens during connect and vice versa. Use sysfs_lock to synchronize event handler with sysfs paths in usbip drivers. Reported-and-tested-by: syzbot+a93fba6d384346a761e3@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Signed-off-by: Shuah Khan --- drivers/usb/usbip/usbip_event.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/usbip/usbip_event.c b/drivers/usb/usbip/usbip_event.c index 5d88917c9631..086ca76dd053 100644 --- a/drivers/usb/usbip/usbip_event.c +++ b/drivers/usb/usbip/usbip_event.c @@ -70,6 +70,7 @@ static void event_handler(struct work_struct *work) while ((ud = get_event()) != NULL) { usbip_dbg_eh("pending event %lx\n", ud->event); + mutex_lock(&ud->sysfs_lock); /* * NOTE: shutdown must come first. * Shutdown the device. @@ -90,6 +91,7 @@ static void event_handler(struct work_struct *work) ud->eh_ops.unusable(ud); unset_event(ud, USBIP_EH_UNUSABLE); } + mutex_unlock(&ud->sysfs_lock); wake_up(&ud->eh_waitq); }