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=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham 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 83968C2BCA1 for ; Sun, 9 Jun 2019 16:48:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5DEDA206DF for ; Sun, 9 Jun 2019 16:48:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560098891; bh=/L4nN1cLrpDNu4y8INv/OnSstEZDePv2AWT52q3KjHk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wNi+3qWFZ+e8Leu3JfcP2xmb3su6dX0Kn3Tq1UbgJhI0SPbPvplWhwOExofwoxu+P TRGXtCKxDL3QhkxgGdDf+dWsyJE/XvYJeILyvkHHgiTTLYvQNMXXMeLxmrjO+xg0Aj N12z+ISeZwgfLy9aqrIuB5BINE0KPArBXlMeseUc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731091AbfFIQsK (ORCPT ); Sun, 9 Jun 2019 12:48:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:47118 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731111AbfFIQsJ (ORCPT ); Sun, 9 Jun 2019 12:48:09 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 58384206C3; Sun, 9 Jun 2019 16:48:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560098888; bh=/L4nN1cLrpDNu4y8INv/OnSstEZDePv2AWT52q3KjHk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2fJb7EW3rTakIyG7yaexmlxUShLMs8iIG0RaAUtYIOAh5NPNZWQce9zTE8/3C9HJ1 wMrIBx+JjVh9HX2E7xzX6dvF9PTsZCcp9h60RzNCBCMpCiBVuk4h+YDXEm79msUfo3 +zxt0XAwbbiFIWtS0JwBsUHCxvakZTCbbfuWThRk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pi-Hsun Shih , Kees Cook Subject: [PATCH 4.19 25/51] pstore: Set tfm to NULL on free_buf_for_compression Date: Sun, 9 Jun 2019 18:42:06 +0200 Message-Id: <20190609164128.597833273@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164127.123076536@linuxfoundation.org> References: <20190609164127.123076536@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pi-Hsun Shih commit a9fb94a99bb515d8720ba8440ce3aba84aec80f8 upstream. Set tfm to NULL on free_buf_for_compression() after crypto_free_comp(). This avoid a use-after-free when allocate_buf_for_compression() and free_buf_for_compression() are called twice. Although free_buf_for_compression() freed the tfm, allocate_buf_for_compression() won't reinitialize the tfm since the tfm pointer is not NULL. Fixes: 95047b0519c1 ("pstore: Refactor compression initialization") Signed-off-by: Pi-Hsun Shih Cc: stable@vger.kernel.org Signed-off-by: Kees Cook Signed-off-by: Greg Kroah-Hartman --- fs/pstore/platform.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -324,8 +324,10 @@ static void allocate_buf_for_compression static void free_buf_for_compression(void) { - if (IS_ENABLED(CONFIG_PSTORE_COMPRESS) && tfm) + if (IS_ENABLED(CONFIG_PSTORE_COMPRESS) && tfm) { crypto_free_comp(tfm); + tfm = NULL; + } kfree(big_oops_buf); big_oops_buf = NULL; big_oops_buf_sz = 0;