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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E220EC43334 for ; Sat, 9 Jul 2022 13:10:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229477AbiGINKA (ORCPT ); Sat, 9 Jul 2022 09:10:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229379AbiGINJ7 (ORCPT ); Sat, 9 Jul 2022 09:09:59 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E23727145 for ; Sat, 9 Jul 2022 06:09:57 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id cp18-20020a17090afb9200b001ef79e8484aso3012564pjb.1 for ; Sat, 09 Jul 2022 06:09:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20210112.gappssmtp.com; s=20210112; h=message-id:date:mime-version:user-agent:content-language:to:cc:from :subject:content-transfer-encoding; bh=ebMhuXzlEOJJA8oEf0a4J3s3X9PShNuFv4U4XZn8r44=; b=Ly7Soe4N58b/A+s7fRefcQE7SA6L6cV5CLnSa7+UIz4WMtAJ7dD0MItimzkOT4MznZ 7WHl1sNqaz8ykraBQfbvkvkGuFyb+hAolvN8iSfQRF1phrgctLDy2EPWLBa7RVMiqzbW XRrQBGYOc9UyIC1ZSvCW3DXr8SKg36oBXwJ0JFmkVgiUt0pjLKFnR8YDWAYd22i88iMC If2A8JLnUdWYXCpdxiNE38YCDHJUIBonsTpPOmUi/d+sFRu1Wmqv6ibQHeHo4k39JtrX D3s9WndgO9j3f+BLC5zLDrK3HJFmHrAKblGkegd6N4aSdjExB7Ejof+pvZSnJ1IuM2Fk XWGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent :content-language:to:cc:from:subject:content-transfer-encoding; bh=ebMhuXzlEOJJA8oEf0a4J3s3X9PShNuFv4U4XZn8r44=; b=6G/7ZMDU9VVOeh7QjGKiqV/l6ITpNb7jcL5vQ82I4TNTSNxdkL4p5HOTqc4vrt3Lyr v3ZsqiYkMUyGiUjO5SazkdGabkesHSguAvsml7Hq91h7pwANgjy8Lvm+WsiV2Ds2HIyq hD/zyCcC/oQ2BxXK52wCruIRQTNMXcCRPQbcem7URGxgYC1kuh8v0fGFubTEVRGmHyTt w1cl2OKcV0NSUBeSMaZnEgGlUt6IS6jN+NrF7Vs9or6KB/u5Eqr4d9YNO9B8V4i25BP5 FgOeZFMfJ701nNerv+Ca/s3tHJxoKwqw7+EJuOiQKo7TNfecdhm28vQKu6aeANDK1CJ3 k4CA== X-Gm-Message-State: AJIora/B97xM8/jtF8NbwRd6aWC0KyTUEjqlKriq/papIQEKFr0Lm98u nk5a/Hxw1W9DN0vWiU3olUXoE8WQhTiQVw== X-Google-Smtp-Source: AGRyM1sP9Lg6k/LzcTX6iCyaicvoyLahdR9mWy96IbePkGy+ocaRSjmpFnX8oCnWrYZT4VNu3M86gw== X-Received: by 2002:a17:903:22ca:b0:16b:f798:1d07 with SMTP id y10-20020a17090322ca00b0016bf7981d07mr9084008plg.59.1657372196131; Sat, 09 Jul 2022 06:09:56 -0700 (PDT) Received: from [192.168.1.100] ([198.8.77.157]) by smtp.gmail.com with ESMTPSA id n11-20020a170902e54b00b0015ee985999dsm1305112plf.97.2022.07.09.06.09.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 09 Jul 2022 06:09:55 -0700 (PDT) Message-ID: Date: Sat, 9 Jul 2022 07:09:54 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Content-Language: en-US To: io-uring Cc: Xiaoguang Wang From: Jens Axboe Subject: [PATCH] io_uring: check that we have a file table when allocating update slots Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org If IORING_FILE_INDEX_ALLOC is set asking for an allocated slot, the helper doesn't check if we actually have a file table or not. The non alloc path does do that correctly, and returns -ENXIO if we haven't set one up. Do the same for the allocated path, avoiding a NULL pointer dereference when trying to find a free bit. Fixes: a7c41b4687f5 ("io_uring: let IORING_OP_FILES_UPDATE support choosing fixed file slots") Signed-off-by: Jens Axboe --- fs/io_uring.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index cddc0e8490af..a01ea49f3017 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7973,6 +7973,9 @@ static int io_files_update_with_index_alloc(struct io_kiocb *req, struct file *file; int ret, fd; + if (!req->ctx->file_data) + return -ENXIO; + for (done = 0; done < req->rsrc_update.nr_args; done++) { if (copy_from_user(&fd, &fds[done], sizeof(fd))) { ret = -EFAULT; -- 2.35.1 -- Jens Axboe