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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CB282C433EF for ; Wed, 20 Apr 2022 11:48:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378251AbiDTLvA (ORCPT ); Wed, 20 Apr 2022 07:51:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378243AbiDTLu6 (ORCPT ); Wed, 20 Apr 2022 07:50:58 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0EA36419B7 for ; Wed, 20 Apr 2022 04:48:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1650455293; x=1681991293; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=tYwucQsfN1+gg+IIOLWeTm84ZtJjUA/HcHCaAjbvdgQ=; b=Ftp98ktsgBGraYvDHGBlEHoiGh9AN1Ho50NQPZkGeNNAl6zp/11EV7ev otsKME4TArtAq841a/JTwPEeUBFxEUZmskxBjJVPXNYqRxivUpnVJtw3p T3WxwzT/Ymton2lq/XCZLrlvC4ngm4RUVtdKi9d8c/kjTDuDlTqvy1Jj/ YhW9rB9aqBQh3GJ3CuF6VArdfGYFHXJNAdLBneORtPT9Ugu6E4jlKz2xq EDZuHTU7jvCni0/nOSElEPKA10QJl2qMNWt9rFWSU8pw4lvGHhfqy+W28 RbuByv9fX7Olj45QdOShsvDS3S6x0/3BYEnIaHGMJflWSjGKVYOB5kyBy w==; X-IronPort-AV: E=McAfee;i="6400,9594,10322"; a="263769544" X-IronPort-AV: E=Sophos;i="5.90,275,1643702400"; d="scan'208";a="263769544" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2022 04:48:12 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,275,1643702400"; d="scan'208";a="529718443" Received: from unknown (HELO localhost.igk.intel.com) ([10.102.102.57]) by orsmga006.jf.intel.com with ESMTP; 20 Apr 2022 04:48:11 -0700 From: Mateusz Grzonka To: linux-raid@vger.kernel.org Cc: jes@trained-monkey.org Subject: [PATCH] Fix possible NULL ptr dereferences and memory leaks Date: Wed, 20 Apr 2022 13:34:00 +0200 Message-Id: <20220420113400.6103-1-mateusz.grzonka@intel.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org In Assemble there was a NULL check for sra variable, which effectively didn't stop the execution in every case. That might have resulted in a NULL pointer dereference. Also in super-ddf, mu variable was set to NULL for some condition, and then immidiately dereferenced. Additionally some memory wasn't freed as well. Signed-off-by: Mateusz Grzonka --- Assemble.c | 7 ++++++- super-ddf.c | 9 +++++++-- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/Assemble.c b/Assemble.c index 704b8293..2bd7f087 100644 --- a/Assemble.c +++ b/Assemble.c @@ -1984,7 +1984,12 @@ int assemble_container_content(struct supertype *st, int mdfd, } sra = sysfs_read(mdfd, NULL, GET_VERSION|GET_DEVS); - if (sra == NULL || strcmp(sra->text_version, content->text_version) != 0) { + if (sra == NULL) { + pr_err("Failed to read sysfs parameters\n"); + return 1; + } + + if (strcmp(sra->text_version, content->text_version) != 0) { if (content->array.major_version == -1 && content->array.minor_version == -2 && c->readonly && diff --git a/super-ddf.c b/super-ddf.c index 3f304cdc..a592c5d7 100644 --- a/super-ddf.c +++ b/super-ddf.c @@ -5125,13 +5125,16 @@ static struct mdinfo *ddf_activate_spare(struct active_array *a, */ vc = find_vdcr(ddf, a->info.container_member, rv->disk.raid_disk, &n_bvd, &vcl); - if (vc == NULL) + if (vc == NULL) { + free(rv); return NULL; + } mu = xmalloc(sizeof(*mu)); if (posix_memalign(&mu->space, 512, sizeof(struct vcl)) != 0) { free(mu); - mu = NULL; + free(rv); + return NULL; } mu->len = ddf->conf_rec_len * 512 * vcl->conf.sec_elmnt_count; @@ -5161,6 +5164,8 @@ static struct mdinfo *ddf_activate_spare(struct active_array *a, pr_err("BUG: can't find disk %d (%d/%d)\n", di->disk.raid_disk, di->disk.major, di->disk.minor); + free(mu); + free(rv); return NULL; } vc->phys_refnum[i_prim] = ddf->phys->entries[dl->pdnum].refnum; -- 2.26.2