From patchwork Wed Apr 14 06:08:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Carpenter X-Patchwork-Id: 12201933 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=-15.8 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, UNPARSEABLE_RELAY 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 C0585C43461 for ; Wed, 14 Apr 2021 06:09:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A15E613C7 for ; Wed, 14 Apr 2021 06:09:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233257AbhDNGJu (ORCPT ); Wed, 14 Apr 2021 02:09:50 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:52368 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229840AbhDNGJt (ORCPT ); Wed, 14 Apr 2021 02:09:49 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 13E64ZWa128459; Wed, 14 Apr 2021 06:09:14 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : mime-version : content-type; s=corp-2020-01-29; bh=QVyht9+yJ8dfT9u8/h2qi0FFBihCppmvtUsB/7xN34o=; b=XD221qAHFQ7YOfWFC+j5D3mO++IQ1s/pBnb6VxCzqPofgai4zSWydUihR44gjLxLaou3 B8P4B0w6F4+7n3e3YBz8CPop2eN8/BgHCwlK6j42ps8/p/pyhgfEIFLPTyJWBg5088Qh 9XgHd2tDYcud+fKbyj2i6ORnERurWKyqNKvenDdqyyKAn/3ykoY3mDJULXr7ekPtVx2E 4tMi5XAZRcgPpr1G/2vhTh6Ku0pt66bPLxw9LRAB6UPkYPVcS9w40Grx77WKDQ3OmIxA p+/NccSwwaaBUdMJo970w7tjfxYSdLOpc4Ow1CHlACTbf3ThL9xE3NS7/RLHR50h114d FA== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by aserp2120.oracle.com with ESMTP id 37u3ymh5sf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 14 Apr 2021 06:09:14 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 13E64Vfn112554; Wed, 14 Apr 2021 06:09:12 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 37unkqjppa-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 14 Apr 2021 06:09:12 +0000 Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 13E695DF023914; Wed, 14 Apr 2021 06:09:09 GMT Received: from mwanda (/10.175.166.128) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 14 Apr 2021 06:09:05 +0000 Date: Wed, 14 Apr 2021 09:08:58 +0300 From: Dan Carpenter To: Sumit Garg Cc: James Bottomley , Jarkko Sakkinen , Mimi Zohar , David Howells , James Morris , "Serge E. Hallyn" , linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] KEYS: trusted: fix a couple error pointer dereferences Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding X-Proofpoint-IMR: 1 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9953 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxlogscore=999 adultscore=0 phishscore=0 malwarescore=0 mlxscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104140043 X-Proofpoint-GUID: RJNP3oqmP6_MQGiSmuiOdzohr_7cx_9X X-Proofpoint-ORIG-GUID: RJNP3oqmP6_MQGiSmuiOdzohr_7cx_9X X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9953 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 mlxlogscore=999 spamscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 bulkscore=0 phishscore=0 suspectscore=0 malwarescore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104140043 Precedence: bulk List-ID: If registering "reg_shm_out" fails, then it is an error pointer and the error handling will call tee_shm_free(reg_shm_out) which leads to an error pointer dereference and an Oops. I've re-arranged it so we only free things that have been allocated successfully. Fixes: 6dd95e650c8a ("KEYS: trusted: Introduce TEE based Trusted Keys") Signed-off-by: Dan Carpenter Reviewed-by: Sumit Garg --- security/keys/trusted-keys/trusted_tee.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/security/keys/trusted-keys/trusted_tee.c b/security/keys/trusted-keys/trusted_tee.c index 2ce66c199e1d..45f96f6ed673 100644 --- a/security/keys/trusted-keys/trusted_tee.c +++ b/security/keys/trusted-keys/trusted_tee.c @@ -65,7 +65,7 @@ static int trusted_tee_seal(struct trusted_key_payload *p, char *datablob) int ret; struct tee_ioctl_invoke_arg inv_arg; struct tee_param param[4]; - struct tee_shm *reg_shm_in = NULL, *reg_shm_out = NULL; + struct tee_shm *reg_shm_in, *reg_shm_out; memset(&inv_arg, 0, sizeof(inv_arg)); memset(¶m, 0, sizeof(param)); @@ -84,7 +84,7 @@ static int trusted_tee_seal(struct trusted_key_payload *p, char *datablob) if (IS_ERR(reg_shm_out)) { dev_err(pvt_data.dev, "blob shm register failed\n"); ret = PTR_ERR(reg_shm_out); - goto out; + goto free_shm_in; } inv_arg.func = TA_CMD_SEAL; @@ -109,11 +109,9 @@ static int trusted_tee_seal(struct trusted_key_payload *p, char *datablob) p->blob_len = param[1].u.memref.size; } -out: - if (reg_shm_out) - tee_shm_free(reg_shm_out); - if (reg_shm_in) - tee_shm_free(reg_shm_in); + tee_shm_free(reg_shm_out); +free_shm_in: + tee_shm_free(reg_shm_in); return ret; } @@ -126,7 +124,7 @@ static int trusted_tee_unseal(struct trusted_key_payload *p, char *datablob) int ret; struct tee_ioctl_invoke_arg inv_arg; struct tee_param param[4]; - struct tee_shm *reg_shm_in = NULL, *reg_shm_out = NULL; + struct tee_shm *reg_shm_in, *reg_shm_out; memset(&inv_arg, 0, sizeof(inv_arg)); memset(¶m, 0, sizeof(param)); @@ -145,7 +143,7 @@ static int trusted_tee_unseal(struct trusted_key_payload *p, char *datablob) if (IS_ERR(reg_shm_out)) { dev_err(pvt_data.dev, "key shm register failed\n"); ret = PTR_ERR(reg_shm_out); - goto out; + goto free_shm_in; } inv_arg.func = TA_CMD_UNSEAL; @@ -170,11 +168,9 @@ static int trusted_tee_unseal(struct trusted_key_payload *p, char *datablob) p->key_len = param[1].u.memref.size; } -out: - if (reg_shm_out) - tee_shm_free(reg_shm_out); - if (reg_shm_in) - tee_shm_free(reg_shm_in); + tee_shm_free(reg_shm_out); +free_shm_in: + tee_shm_free(reg_shm_in); return ret; }