From patchwork Mon Mar 15 13:52:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 401509 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, USER_AGENT_GIT autolearn=ham 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 036DAC43142 for ; Mon, 15 Mar 2021 13:59:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CADBA64F25 for ; Mon, 15 Mar 2021 13:59:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229735AbhCON7U (ORCPT ); Mon, 15 Mar 2021 09:59:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:37476 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232257AbhCON6Q (ORCPT ); Mon, 15 Mar 2021 09:58:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DE2BB64F07; Mon, 15 Mar 2021 13:58:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816696; bh=MM8h9pSZ/19i18U1Dbp8uKWmfV4/joyYNuc/4IEtrYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X7HR8dyf+Wmyw5qVV1z2sRgALsP+qNC3mnAPR3a7WYgyUULLbJX2LiAS9/HCgwXVJ 1qM0KHprdKfVx09B4WbBfZxQ8eLIEuPK+40txVCHbCqeLCoHV6zydP4juoZdG+oIhH AFuqR+Kzos8opx1UE/s4/NCna9EYe16un5Ow/UKM= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julian Wiedmann , Alexandra Winter , "David S. Miller" Subject: [PATCH 5.10 061/290] s390/qeth: fix memory leak after failed TX Buffer allocation Date: Mon, 15 Mar 2021 14:52:34 +0100 Message-Id: <20210315135543.979604801@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135541.921894249@linuxfoundation.org> References: <20210315135541.921894249@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Julian Wiedmann commit e7a36d27f6b9f389e41d8189a8a08919c6835732 upstream. When qeth_alloc_qdio_queues() fails to allocate one of the buffers that back an Output Queue, the 'out_freeoutqbufs' path will free all previously allocated buffers for this queue. But it misses to free the half-finished queue struct itself. Move the buffer allocation into qeth_alloc_output_queue(), and deal with such errors internally. Fixes: 0da9581ddb0f ("qeth: exploit asynchronous delivery of storage blocks") Signed-off-by: Julian Wiedmann Reviewed-by: Alexandra Winter Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/s390/net/qeth_core_main.c | 35 +++++++++++++++++------------------ 1 file changed, 17 insertions(+), 18 deletions(-) --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -2632,15 +2632,28 @@ static void qeth_free_output_queue(struc static struct qeth_qdio_out_q *qeth_alloc_output_queue(void) { struct qeth_qdio_out_q *q = kzalloc(sizeof(*q), GFP_KERNEL); + unsigned int i; if (!q) return NULL; - if (qdio_alloc_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q)) { - kfree(q); - return NULL; + if (qdio_alloc_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q)) + goto err_qdio_bufs; + + for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) { + if (qeth_init_qdio_out_buf(q, i)) + goto err_out_bufs; } + return q; + +err_out_bufs: + while (i > 0) + kmem_cache_free(qeth_qdio_outbuf_cache, q->bufs[--i]); + qdio_free_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q); +err_qdio_bufs: + kfree(q); + return NULL; } static void qeth_tx_completion_timer(struct timer_list *timer) @@ -2653,7 +2666,7 @@ static void qeth_tx_completion_timer(str static int qeth_alloc_qdio_queues(struct qeth_card *card) { - int i, j; + unsigned int i; QETH_CARD_TEXT(card, 2, "allcqdbf"); @@ -2687,13 +2700,6 @@ static int qeth_alloc_qdio_queues(struct queue->coalesce_usecs = QETH_TX_COALESCE_USECS; queue->max_coalesced_frames = QETH_TX_MAX_COALESCED_FRAMES; queue->priority = QETH_QIB_PQUE_PRIO_DEFAULT; - - /* give outbound qeth_qdio_buffers their qdio_buffers */ - for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) { - WARN_ON(queue->bufs[j]); - if (qeth_init_qdio_out_buf(queue, j)) - goto out_freeoutqbufs; - } } /* completion */ @@ -2702,13 +2708,6 @@ static int qeth_alloc_qdio_queues(struct return 0; -out_freeoutqbufs: - while (j > 0) { - --j; - kmem_cache_free(qeth_qdio_outbuf_cache, - card->qdio.out_qs[i]->bufs[j]); - card->qdio.out_qs[i]->bufs[j] = NULL; - } out_freeoutq: while (i > 0) { qeth_free_output_queue(card->qdio.out_qs[--i]);