From patchwork Sun Sep 1 18:06:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Iooss X-Patchwork-Id: 11125611 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7A2B117EF for ; Sun, 1 Sep 2019 18:06:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5712B2190F for ; Sun, 1 Sep 2019 18:06:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729036AbfIASG4 (ORCPT ); Sun, 1 Sep 2019 14:06:56 -0400 Received: from mx1.polytechnique.org ([129.104.30.34]:45210 "EHLO mx1.polytechnique.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728952AbfIASGz (ORCPT ); Sun, 1 Sep 2019 14:06:55 -0400 Received: from localhost.localdomain (85-168-38-217.rev.numericable.fr [85.168.38.217]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ssl.polytechnique.org (Postfix) with ESMTPSA id BF6B9564884 for ; Sun, 1 Sep 2019 20:06:53 +0200 (CEST) From: Nicolas Iooss To: selinux@vger.kernel.org Subject: [PATCH 3/9] libsepol: do not dereference a failed allocated pointer Date: Sun, 1 Sep 2019 20:06:30 +0200 Message-Id: <20190901180636.31586-4-nicolas.iooss@m4x.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190901180636.31586-1-nicolas.iooss@m4x.org> References: <20190901180636.31586-1-nicolas.iooss@m4x.org> MIME-Version: 1.0 X-AV-Checked: ClamAV using ClamSMTP at svoboda.polytechnique.org (Sun Sep 1 20:06:53 2019 +0200 (CEST)) X-Spam-Flag: No, tests=bogofilter, spamicity=0.000004, queueID=DF0C4564880 X-Org-Mail: nicolas.iooss.2010@polytechnique.org Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org When strs_stack_init(&stack) fails to allocate memory and stack is still NULL, it should not be dereferenced with strs_stack_pop(stack). This issue has been found using Infer static analyzer. Signed-off-by: Nicolas Iooss --- libsepol/src/kernel_to_cil.c | 8 +++++--- libsepol/src/kernel_to_conf.c | 8 +++++--- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/libsepol/src/kernel_to_cil.c b/libsepol/src/kernel_to_cil.c index 320af37b2bc8..9fcc254707ba 100644 --- a/libsepol/src/kernel_to_cil.c +++ b/libsepol/src/kernel_to_cil.c @@ -108,10 +108,12 @@ static char *cond_expr_to_str(struct policydb *pdb, struct cond_expr *expr) return str; exit: - while ((new_val = strs_stack_pop(stack)) != NULL) { - free(new_val); + if (stack) { + while ((new_val = strs_stack_pop(stack)) != NULL) { + free(new_val); + } + strs_stack_destroy(&stack); } - strs_stack_destroy(&stack); return NULL; } diff --git a/libsepol/src/kernel_to_conf.c b/libsepol/src/kernel_to_conf.c index 930bafabdd4b..2c8da49a11ab 100644 --- a/libsepol/src/kernel_to_conf.c +++ b/libsepol/src/kernel_to_conf.c @@ -106,10 +106,12 @@ static char *cond_expr_to_str(struct policydb *pdb, struct cond_expr *expr) return str; exit: - while ((new_val = strs_stack_pop(stack)) != NULL) { - free(new_val); + if (stack != NULL) { + while ((new_val = strs_stack_pop(stack)) != NULL) { + free(new_val); + } + strs_stack_destroy(&stack); } - strs_stack_destroy(&stack); return NULL; }