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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 54097C352A2 for ; Thu, 6 Feb 2020 16:52:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2AFB220838 for ; Thu, 6 Feb 2020 16:52:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="tFT94kIn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727727AbgBFQwE (ORCPT ); Thu, 6 Feb 2020 11:52:04 -0500 Received: from mail-ed1-f67.google.com ([209.85.208.67]:45598 "EHLO mail-ed1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727358AbgBFQwE (ORCPT ); Thu, 6 Feb 2020 11:52:04 -0500 Received: by mail-ed1-f67.google.com with SMTP id v28so6652853edw.12; Thu, 06 Feb 2020 08:52:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=SJxFgsecqtei72spXgyrudIkZIJGgELlpouGAqZ4/us=; b=tFT94kInRIvGnjurirgdAOKPn+CQH1ryOj12OD0drFnemVonOKNuX9RNNbDT9RrO5I 180vflqSELjgRysD/U+RFVKDuCexZXcHF5x2ge0bm8cJqKjIAFQBregPcgPVtG29tZkN drFMkXqR9JYfBuz1nqLdxqgStVNL88M0bt8iwSjH9EiNCD6TNw8Plr3HPuxU9dfRDuKp kLtdmiP/9bDm7iP8utNCx7QVGxDIM/L5P/JXDf//wl9JMZg0hNyI4zHLR8epruHzUkuD Dh0soyOnpFT0SOmaptgECWpVuPvz3y0jAyw0G78oDBCvzVaSEX2uhBtt44sUwXnjU41P DiHg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=SJxFgsecqtei72spXgyrudIkZIJGgELlpouGAqZ4/us=; b=g49qy9REz5XeMpVehLQWzoW2C+3Jh4D7pVehlMaXSl+a+yc+2PObbsc26XEzU2/Ksa iVIwXp+QYQWPHtmCvDvnvWgP6tlV22wyfLycVipYoI7pqSVSHxu49J2qmx/YVuWpxnUj UoePPchEgOLFnVUB7pVyQx+7IiFLqZ9QnjJy8Dohf+guRjz+1peYj9kp+IHTAerI0/Cv gHKUb3p9Cj+ni0tGsdDox5YMPYQbSEzHCTQxi4dm7lBU1szDqyfUf/elMoqTiOorRA3Y zi4WQ3QHsLpBC8xwmlcuC9vREGGyQj4i44NFZMinZl1+4ccQnd6SyWiLNZGa1UPU+91s lH2A== X-Gm-Message-State: APjAAAXxpahrIzHIwm7uDfd7aQanjHbb4AiHSIgY3aDsy8KOZyF8YOEF JixT2k5X+Boax466Y9Nro4I= X-Google-Smtp-Source: APXvYqy+auJcYYJdToXmFqwPTZvEXE1DfEJIG7HuQmqsu4zH/qi96tHhVCFSqjY66+CHfw3ZUF3NRg== X-Received: by 2002:a05:6402:1e1:: with SMTP id i1mr3854649edy.338.1581007922255; Thu, 06 Feb 2020 08:52:02 -0800 (PST) Received: from localhost.localdomain ([109.126.145.62]) by smtp.gmail.com with ESMTPSA id y4sm7015ejp.50.2020.02.06.08.52.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Feb 2020 08:52:01 -0800 (PST) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] io_uring: fix deferred req iovec leak Date: Thu, 6 Feb 2020 19:51:16 +0300 Message-Id: X-Mailer: git-send-email 2.24.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org After defer, a request will be prepared, that includes allocating iovec if needed, and then submitted through io_wq_submit_work() but not custom handler (e.g. io_rw_async()/io_sendrecv_async()). However, it'll leak iovec, as it's in io-wq and the code goes as follows: io_read() { if (!io_wq_current_is_worker()) kfree(iovec); } Put all deallocation logic in io_{read,write,send,recv}(), which will leave the memory, if going async with -EAGAIN. It also fixes a leak after failed io_alloc_async_ctx() in io_{recv,send}_msg(). Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 47 ++++++++++++----------------------------------- 1 file changed, 12 insertions(+), 35 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index bff7a03e873f..ce3dbd2b1b5c 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2143,17 +2143,6 @@ static int io_alloc_async_ctx(struct io_kiocb *req) return req->io == NULL; } -static void io_rw_async(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); - struct iovec *iov = NULL; - - if (req->io->rw.iov != req->io->rw.fast_iov) - iov = req->io->rw.iov; - io_wq_submit_work(workptr); - kfree(iov); -} - static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, struct iovec *iovec, struct iovec *fast_iov, struct iov_iter *iter) @@ -2166,7 +2155,6 @@ static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, io_req_map_rw(req, io_size, iovec, fast_iov, iter); } - req->work.func = io_rw_async; return 0; } @@ -2253,8 +2241,7 @@ static int io_read(struct io_kiocb *req, struct io_kiocb **nxt, } } out_free: - if (!io_wq_current_is_worker()) - kfree(iovec); + kfree(iovec); return ret; } @@ -2359,8 +2346,7 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt, } } out_free: - if (!io_wq_current_is_worker()) - kfree(iovec); + kfree(iovec); return ret; } @@ -2955,19 +2941,6 @@ static int io_sync_file_range(struct io_kiocb *req, struct io_kiocb **nxt, return 0; } -#if defined(CONFIG_NET) -static void io_sendrecv_async(struct io_wq_work **workptr) -{ - struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); - struct iovec *iov = NULL; - - if (req->io->rw.iov != req->io->rw.fast_iov) - iov = req->io->msg.iov; - io_wq_submit_work(workptr); - kfree(iov); -} -#endif - static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { #if defined(CONFIG_NET) @@ -3036,17 +3009,19 @@ static int io_sendmsg(struct io_kiocb *req, struct io_kiocb **nxt, if (force_nonblock && ret == -EAGAIN) { if (req->io) return -EAGAIN; - if (io_alloc_async_ctx(req)) + if (io_alloc_async_ctx(req)) { + if (kmsg && kmsg->iov != kmsg->fast_iov) + kfree(kmsg->iov); return -ENOMEM; + } memcpy(&req->io->msg, &io.msg, sizeof(io.msg)); - req->work.func = io_sendrecv_async; return -EAGAIN; } if (ret == -ERESTARTSYS) ret = -EINTR; } - if (!io_wq_current_is_worker() && kmsg && kmsg->iov != kmsg->fast_iov) + if (kmsg && kmsg->iov != kmsg->fast_iov) kfree(kmsg->iov); io_cqring_add_event(req, ret); if (ret < 0) @@ -3180,17 +3155,19 @@ static int io_recvmsg(struct io_kiocb *req, struct io_kiocb **nxt, if (force_nonblock && ret == -EAGAIN) { if (req->io) return -EAGAIN; - if (io_alloc_async_ctx(req)) + if (io_alloc_async_ctx(req)) { + if (kmsg && kmsg->iov != kmsg->fast_iov) + kfree(kmsg->iov); return -ENOMEM; + } memcpy(&req->io->msg, &io.msg, sizeof(io.msg)); - req->work.func = io_sendrecv_async; return -EAGAIN; } if (ret == -ERESTARTSYS) ret = -EINTR; } - if (!io_wq_current_is_worker() && kmsg && kmsg->iov != kmsg->fast_iov) + if (kmsg && kmsg->iov != kmsg->fast_iov) kfree(kmsg->iov); io_cqring_add_event(req, ret); if (ret < 0) -- 2.24.0