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=-18.8 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 7FF09C433B4 for ; Mon, 5 Apr 2021 08:56:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 17212613A4 for ; Mon, 5 Apr 2021 08:56:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232502AbhDEI4p (ORCPT ); Mon, 5 Apr 2021 04:56:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:34792 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232909AbhDEI4Y (ORCPT ); Mon, 5 Apr 2021 04:56:24 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A807B610E8; Mon, 5 Apr 2021 08:56:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617612978; bh=kPHWAkUxrG8FymUtRS+p4OnqtwHyUCmrfDk9wyyS04Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ywhUOTMU8OMsVh2MFjE6HtJ9nJlQqSjNROmUgoxPHiFy26nU9Xx8GHwyGZphUzaHr uxBg4bHiQKN5CeD0LW5dM0YvCTWhMyS39xxu3PUhFRUTYjLK41h9/r76x9xMUWDynz WB0u4KPn459VzKMxErko7z4Lj+qDbwE7q9UYEV7I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Kai=20M=C3=A4kisara?= , Lv Yunlong , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.4 08/28] scsi: st: Fix a use after free in st_open() Date: Mon, 5 Apr 2021 10:53:42 +0200 Message-Id: <20210405085017.288255572@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210405085017.012074144@linuxfoundation.org> References: <20210405085017.012074144@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: 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 088a68ab4246..3a3876091a9d 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -1267,8 +1267,8 @@ 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