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 48536C433EF for ; Mon, 13 Jun 2022 13:33:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376845AbiFMNdA (ORCPT ); Mon, 13 Jun 2022 09:33:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378113AbiFMNax (ORCPT ); Mon, 13 Jun 2022 09:30:53 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C7D313D6A; Mon, 13 Jun 2022 04:25:38 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id EAE5E60F18; Mon, 13 Jun 2022 11:25:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00E52C36B07; Mon, 13 Jun 2022 11:25:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655119537; bh=b/9qIeG94uHBo4HSzdZoF9DK2yKWhDCwVZXzJ95coXI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mcjtbUIL9ahrf5EWb11Q/dNj8ArcwREoAqq1T3TmX0CFY1oFH93FrMJlfzlWijVQ6 Pa1J/lnL6Iip74bJva+Ml/tog+hjq580YykE94y5s2BrNplaX2KGwhEZtFlIueh7ko PxyTEmz26y+F4Mi7TmTyNFDsx2kVHhGP0RKUPTKE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiaomeng Tong , Sasha Levin Subject: [PATCH 5.18 029/339] firmware: stratix10-svc: fix a missing check on list iterator Date: Mon, 13 Jun 2022 12:07:34 +0200 Message-Id: <20220613094927.397080499@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220613094926.497929857@linuxfoundation.org> References: <20220613094926.497929857@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: stable@vger.kernel.org From: Xiaomeng Tong [ Upstream commit 5a0793ac66ac0e254d292f129a4d6c526f9f2aff ] The bug is here: pmem->vaddr = NULL; The list iterator 'pmem' will point to a bogus position containing HEAD if the list is empty or no element is found. This case must be checked before any use of the iterator, otherwise it will lead to a invalid memory access. To fix this bug, just gen_pool_free/set NULL/list_del() and return when found, otherwise list_del HEAD and return; Fixes: 7ca5ce896524f ("firmware: add Intel Stratix10 service layer driver") Signed-off-by: Xiaomeng Tong Link: https://lore.kernel.org/r/20220414035609.2239-1-xiam0nd.tong@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/firmware/stratix10-svc.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c index 8177a0fae11d..14663f671323 100644 --- a/drivers/firmware/stratix10-svc.c +++ b/drivers/firmware/stratix10-svc.c @@ -948,17 +948,17 @@ EXPORT_SYMBOL_GPL(stratix10_svc_allocate_memory); void stratix10_svc_free_memory(struct stratix10_svc_chan *chan, void *kaddr) { struct stratix10_svc_data_mem *pmem; - size_t size = 0; list_for_each_entry(pmem, &svc_data_mem, node) if (pmem->vaddr == kaddr) { - size = pmem->size; - break; + gen_pool_free(chan->ctrl->genpool, + (unsigned long)kaddr, pmem->size); + pmem->vaddr = NULL; + list_del(&pmem->node); + return; } - gen_pool_free(chan->ctrl->genpool, (unsigned long)kaddr, size); - pmem->vaddr = NULL; - list_del(&pmem->node); + list_del(&svc_data_mem); } EXPORT_SYMBOL_GPL(stratix10_svc_free_memory); -- 2.35.1