From patchwork Sat Aug 19 08:39:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Wang X-Patchwork-Id: 715129 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 92D64EE49A8 for ; Sat, 19 Aug 2023 08:40:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229619AbjHSIkS (ORCPT ); Sat, 19 Aug 2023 04:40:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229457AbjHSIkS (ORCPT ); Sat, 19 Aug 2023 04:40:18 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 999459FC42; Sat, 19 Aug 2023 01:40:15 -0700 (PDT) Received: from dggpeml500025.china.huawei.com (unknown [172.30.72.56]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4RSXF722k6zVkJQ; Sat, 19 Aug 2023 16:38:03 +0800 (CST) Received: from hulk-vt.huawei.com (10.67.174.21) by dggpeml500025.china.huawei.com (7.185.36.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Sat, 19 Aug 2023 16:40:12 +0800 From: Zhu Wang To: , , , , , , , , CC: Subject: [PATCH -next] scsi: snic: fix double free in snic_tgt_create() Date: Sat, 19 Aug 2023 08:39:41 +0000 Message-ID: <20230819083941.164365-1-wangzhu9@huawei.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.67.174.21] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpeml500025.china.huawei.com (7.185.36.35) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org The commit 41320b18a0e0 ("scsi: snic: Fix possible memory leak if device_add() fails") fix the memory leak caused by dev_set_name() when device_add() failed. While it did not consider that 'tgt' has already been released when put_device(&tgt->dev) is called. We removed kfree(tgt) in the error path to avoid double free 'tgt'. And we moved put_device(&tgt->dev) after the removed kfree(tgt) to avoid UAF (Use-After-Free). Fixes: 41320b18a0e0 ("scsi: snic: Fix possible memory leak if device_add() fails") Signed-off-by: Zhu Wang --- drivers/scsi/snic/snic_disc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/scsi/snic/snic_disc.c b/drivers/scsi/snic/snic_disc.c index e429ad23c396..4db3ba62fcd3 100644 --- a/drivers/scsi/snic/snic_disc.c +++ b/drivers/scsi/snic/snic_disc.c @@ -303,12 +303,11 @@ snic_tgt_create(struct snic *snic, struct snic_tgt_id *tgtid) "Snic Tgt: device_add, with err = %d\n", ret); - put_device(&tgt->dev); put_device(&snic->shost->shost_gendev); spin_lock_irqsave(snic->shost->host_lock, flags); list_del(&tgt->list); spin_unlock_irqrestore(snic->shost->host_lock, flags); - kfree(tgt); + put_device(&tgt->dev); tgt = NULL; return tgt;