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=-19.1 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=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 4E147C433FE for ; Thu, 16 Sep 2021 17:23:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B422610E9 for ; Thu, 16 Sep 2021 17:23:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352588AbhIPRY6 (ORCPT ); Thu, 16 Sep 2021 13:24:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:39922 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343575AbhIPRQG (ORCPT ); Thu, 16 Sep 2021 13:16:06 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D806C61BBE; Thu, 16 Sep 2021 16:40:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631810417; bh=2xJEJpfSoyORzGxGTI3s7ieeq25y1kEm0yKthuAsI48=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fr5GS6IKl7iRlP1CBo3IyJNjwsZdfwohHYleENJYjjEnKde75OUVOXkMqmxTSxkDy kSKDpoHJvesTkzVgDAL2UbWj41pvZrLpD83hl3h4V0aelg3NEjalR3sBQgkMMz/c9m 1lEsCg7Ju/Ix2ekHoQLdoZYbzhgOh6KmU/+fSjoo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Avri Altman , Daejun Park , Bart Van Assche , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.14 091/432] scsi: ufs: Fix memory corruption by ufshcd_read_desc_param() Date: Thu, 16 Sep 2021 17:57:20 +0200 Message-Id: <20210916155813.863232564@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210916155810.813340753@linuxfoundation.org> References: <20210916155810.813340753@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: Bart Van Assche [ Upstream commit d3d9c4570285090b533b00946b72647361f0345b ] If param_offset > buff_len then the memcpy() statement in ufshcd_read_desc_param() corrupts memory since it copies 256 + buff_len - param_offset bytes into a buffer with size buff_len. Since param_offset < 256 this results in writing past the bound of the output buffer. Link: https://lore.kernel.org/r/20210722033439.26550-2-bvanassche@acm.org Fixes: cbe193f6f093 ("scsi: ufs: Fix potential NULL pointer access during memcpy") Reviewed-by: Avri Altman Reviewed-by: Daejun Park Signed-off-by: Bart Van Assche Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/ufs/ufshcd.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 708b3b62fc4d..179227180961 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -3419,9 +3419,11 @@ int ufshcd_read_desc_param(struct ufs_hba *hba, if (is_kmalloc) { /* Make sure we don't copy more data than available */ - if (param_offset + param_size > buff_len) - param_size = buff_len - param_offset; - memcpy(param_read_buf, &desc_buf[param_offset], param_size); + if (param_offset >= buff_len) + ret = -EINVAL; + else + memcpy(param_read_buf, &desc_buf[param_offset], + min_t(u32, param_size, buff_len - param_offset)); } out: if (is_kmalloc) -- 2.30.2