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=-20.2 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=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 38581C433F5 for ; Mon, 20 Sep 2021 17:36:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2176A61B26 for ; Mon, 20 Sep 2021 17:36:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352137AbhITRiE (ORCPT ); Mon, 20 Sep 2021 13:38:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:40476 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348137AbhITRgI (ORCPT ); Mon, 20 Sep 2021 13:36:08 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D715B61B1E; Mon, 20 Sep 2021 17:06:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632157583; bh=lYhlJUiZeJ71eAsBUsEU418h4Qd1oNkRZB8M5J6fuKI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oWsYmu43/mzoIsL8emvSpE0tL/wNIWeUyMh5FGeOYg6gq2byIWQfNXdUInenZXn07 rFFYBw40pY7F6GKWM8O4YXDxGnnBr8GPThj5NYkdQwR7C0XJriSKFZqEJm+uHJkVr/ 8g0j3R6kytcmv8dSv57y5o5QQHaqKmF6G2q2Ds2I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hongbo Li , Herbert Xu , Sasha Levin Subject: [PATCH 4.19 057/293] lib/mpi: use kcalloc in mpi_resize Date: Mon, 20 Sep 2021 18:40:19 +0200 Message-Id: <20210920163935.208923682@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163933.258815435@linuxfoundation.org> References: <20210920163933.258815435@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: stable@vger.kernel.org From: Hongbo Li [ Upstream commit b6f756726e4dfe75be1883f6a0202dcecdc801ab ] We should set the additional space to 0 in mpi_resize(). So use kcalloc() instead of kmalloc_array(). In lib/mpi/ec.c: /**************** * Resize the array of A to NLIMBS. the additional space is cleared * (set to 0) [done by m_realloc()] */ int mpi_resize(MPI a, unsigned nlimbs) Like the comment of kernel's mpi_resize() said, the additional space need to be set to 0, but when a->d is not NULL, it does not set. The kernel's mpi lib is from libgcrypt, the mpi resize in libgcrypt is _gcry_mpi_resize() which set the additional space to 0. This bug may cause mpi api which use mpi_resize() get wrong result under the condition of using the additional space without initiation. If this condition is not met, the bug would not be triggered. Currently in kernel, rsa, sm2 and dh use mpi lib, and they works well, so the bug is not triggered in these cases. add_points_edwards() use the additional space directly, so it will get a wrong result. Fixes: cdec9cb5167a ("crypto: GnuPG based MPI lib - source files (part 1)") Signed-off-by: Hongbo Li Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- lib/mpi/mpiutil.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/mpi/mpiutil.c b/lib/mpi/mpiutil.c index 20ed0f766787..00825028cc84 100644 --- a/lib/mpi/mpiutil.c +++ b/lib/mpi/mpiutil.c @@ -91,7 +91,7 @@ int mpi_resize(MPI a, unsigned nlimbs) return 0; /* no need to do it */ if (a->d) { - p = kmalloc_array(nlimbs, sizeof(mpi_limb_t), GFP_KERNEL); + p = kcalloc(nlimbs, sizeof(mpi_limb_t), GFP_KERNEL); if (!p) return -ENOMEM; memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t)); -- 2.30.2