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=-19.1 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 C1E40C4332F for ; Mon, 13 Sep 2021 14:49:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 93E6B61165 for ; Mon, 13 Sep 2021 14:49:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347415AbhIMOtT (ORCPT ); Mon, 13 Sep 2021 10:49:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:58820 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347645AbhIMOoY (ORCPT ); Mon, 13 Sep 2021 10:44:24 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DEE696113B; Mon, 13 Sep 2021 13:57:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631541458; bh=I5NO4vbOtc+RqNT1FsktWqoBMD/ekz/C/KDVI5jjs7Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I1wu6HY7wHcDfn/9zYVurvn9s801DKMJD9fKxmT/StEHesQ9DQmV21v3ksGEAbIAH JuYqHT84R6AqtWKa5x4Gku99xUSzRLmnLulSMrscpdc1m8mukGQT7kQtnH5mgvPIOQ HVkiFp95HFPPZhpw1oZhInWM9Hv+pIPHKdhVy/4U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Begunkov , Jens Axboe Subject: [PATCH 5.14 304/334] bio: fix page leak bio_add_hw_page failure Date: Mon, 13 Sep 2021 15:15:58 +0200 Message-Id: <20210913131123.698338684@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131113.390368911@linuxfoundation.org> References: <20210913131113.390368911@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 commit d9cf3bd531844ffbfe94b16e417037a16efc988d upstream. __bio_iov_append_get_pages() doesn't put not appended pages on bio_add_hw_page() failure, so potentially leaking them, fix it. Also, do the same for __bio_iov_iter_get_pages(), even though it looks like it can't be triggered by userspace in this case. Fixes: 0512a75b98f8 ("block: Introduce REQ_OP_ZONE_APPEND") Cc: stable@vger.kernel.org # 5.8+ Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/1edfa6a2ffd66d55e6345a477df5387d2c1415d0.1626653825.git.asml.silence@gmail.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/bio.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) --- a/block/bio.c +++ b/block/bio.c @@ -979,6 +979,14 @@ static int bio_iov_bvec_set_append(struc return 0; } +static void bio_put_pages(struct page **pages, size_t size, size_t off) +{ + size_t i, nr = DIV_ROUND_UP(size + (off & ~PAGE_MASK), PAGE_SIZE); + + for (i = 0; i < nr; i++) + put_page(pages[i]); +} + #define PAGE_PTRS_PER_BVEC (sizeof(struct bio_vec) / sizeof(struct page *)) /** @@ -1023,8 +1031,10 @@ static int __bio_iov_iter_get_pages(stru if (same_page) put_page(page); } else { - if (WARN_ON_ONCE(bio_full(bio, len))) - return -EINVAL; + if (WARN_ON_ONCE(bio_full(bio, len))) { + bio_put_pages(pages + i, left, offset); + return -EINVAL; + } __bio_add_page(bio, page, len, offset); } offset = 0; @@ -1069,6 +1079,7 @@ static int __bio_iov_append_get_pages(st len = min_t(size_t, PAGE_SIZE - offset, left); if (bio_add_hw_page(q, bio, page, len, offset, max_append_sectors, &same_page) != len) { + bio_put_pages(pages + i, left, offset); ret = -EINVAL; break; }