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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 D3D4FC433E2 for ; Thu, 25 Mar 2021 11:32:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A35AF61A4B for ; Thu, 25 Mar 2021 11:32:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230396AbhCYLb6 (ORCPT ); Thu, 25 Mar 2021 07:31:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:35294 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231739AbhCYL3b (ORCPT ); Thu, 25 Mar 2021 07:29:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 08A0161A85; Thu, 25 Mar 2021 11:27:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616671661; bh=dYFPrqF9QeI9Yq5VHdYVsI4HQn3dS2qEKnFI0wciVnA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iYo9Ioufp4szMoIDcbPufHvDoVyDz+QuyVAWaQPvVRJMMun6IdOZJosEptI5pGBvy ARu+xrszGPh898n6YTLBPdkyzl9Y2iaMWtFw15pJjSjX9YyChuCE8DNgwb5V6ur3f+ qyMgw3fhxwkCyO8CZuRcTjChwEkVBk3l7d1/byIpN4egUtMQil9Y5nR+MjVzz4S6+W eUoCDHlGUL6ARyMic+mlQRfbLmNzcBUbwn/xIseX4dAdvTpWh/6J2uyA1vuerm3OqQ Qa3dxXywoPlz48dr/bzwdg7gdjVzC87suXgVgLSIK25RpI8oQFuQUkaFLpoiOQWehY cPPqaKdYEcmjQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lv Yunlong , =?UTF-8?q?Kai=20M=C3=A4kisara?= , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 13/20] scsi: st: Fix a use after free in st_open() Date: Thu, 25 Mar 2021 07:27:17 -0400 Message-Id: <20210325112724.1928174-13-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210325112724.1928174-1-sashal@kernel.org> References: <20210325112724.1928174-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lv Yunlong [ Upstream commit c8c165dea4c8f5ad67b1240861e4f6c5395fa4ac ] In st_open(), if STp->in_use is true, STp will be freed by scsi_tape_put(). However, STp is still used by DEBC_printk() after. It is better to DEBC_printk() before scsi_tape_put(). Link: https://lore.kernel.org/r/20210311064636.10522-1-lyl2019@mail.ustc.edu.cn Acked-by: Kai Mäkisara Signed-off-by: Lv Yunlong Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/st.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 307df2fa39a3..5078db7743cd 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -1265,8 +1265,8 @@ static int st_open(struct inode *inode, struct file *filp) spin_lock(&st_use_lock); if (STp->in_use) { spin_unlock(&st_use_lock); - scsi_tape_put(STp); DEBC_printk(STp, "Device already in use.\n"); + scsi_tape_put(STp); return (-EBUSY); } -- 2.30.1