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=-18.8 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 1D5EEC433ED for ; Mon, 5 Apr 2021 09:09:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E5E3E61002 for ; Mon, 5 Apr 2021 09:09:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238802AbhDEJJF (ORCPT ); Mon, 5 Apr 2021 05:09:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:51474 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237981AbhDEJGo (ORCPT ); Mon, 5 Apr 2021 05:06:44 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6B11B613A7; Mon, 5 Apr 2021 09:06:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617613599; bh=dnwRBHEZkgWC5nEUpVNrrxdByp4adnNF+/ucinqL51Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SXFXux4OughJx8YByu8t/EGroQpDsOOtGmcGt5DQOkNC5yWJ6L6KwrWWS7KF3a/qR P1qxFQKNlPtd6uddh53e6ycia7xxFemaneuKyxwo3+1+ztTkBPpWCbMIQno6IhzQ/v R1jzRTO7zd4nmeh54i/yk8mnLx0Unjwo6CsQQ3Io= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Begunkov , Jens Axboe , Sasha Levin Subject: [PATCH 5.10 022/126] io_uring: fix ->flags races by linked timeouts Date: Mon, 5 Apr 2021 10:53:04 +0200 Message-Id: <20210405085031.764486619@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210405085031.040238881@linuxfoundation.org> References: <20210405085031.040238881@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pavel Begunkov [ Upstream commit efe814a471e0e58f28f1efaf430c8784a4f36626 ] It's racy to modify req->flags from a not owning context, e.g. linked timeout calling req_set_fail_links() for the master request might race with that request setting/clearing flags while being executed concurrently. Just remove req_set_fail_links(prev) from io_link_timeout_fn(), io_async_find_and_cancel() and functions down the line take care of setting the fail bit. Signed-off-by: Pavel Begunkov Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- fs/io_uring.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index dde290eb7dd0..4e53445db73f 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6242,7 +6242,6 @@ static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) spin_unlock_irqrestore(&ctx->completion_lock, flags); if (prev) { - req_set_fail_links(prev); io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); io_put_req_deferred(prev, 1); } else { -- 2.30.1