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 10427C28EBD for ; Sun, 9 Jun 2019 16:57:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB6AB207E0 for ; Sun, 9 Jun 2019 16:57:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099471; bh=NELJ4Hu6YiJbJlmxwVlRRrxhcEXBUQ4E/XUnMCsrArw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WyB520zu3hjlDX9GzBK3fxGNu2cex9QP5dpMGk44vSYIXu87txs1sTvTmfN+4tDkm 285FipBXu4wxwEXbK64kgQgp0fXV2cFbjL/4tJlLa0Kbt+7GSqptJeQI3Ud9m/Eb3r lOVoRNJ1FPYQV9T6t1sCg381CdUo10YDLVKtGXr0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732656AbfFIQ5t (ORCPT ); Sun, 9 Jun 2019 12:57:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:60866 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733230AbfFIQ5o (ORCPT ); Sun, 9 Jun 2019 12:57:44 -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 C7035206DF; Sun, 9 Jun 2019 16:57:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099464; bh=NELJ4Hu6YiJbJlmxwVlRRrxhcEXBUQ4E/XUnMCsrArw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QNCZOsBZrH3ts+STNvbAZgc4fE1KHvtIqLeoQaDP3cMR6AtoFinjGkLHToFdf+b8G BhR5gZ3+mXLciWf3IcaOPuwJIHJ5R8UDzZOsh3ubnLoXtYu8eIWUCOFqJZm30QyHZO N2aWyjelGVdYP7h4ooQiEqJE3N1ASc9f6C2Fvhfo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tim Chen , Eric Biggers , Herbert Xu Subject: [PATCH 4.4 005/241] crypto: crct10dif-generic - fix use via crypto_shash_digest() Date: Sun, 9 Jun 2019 18:39:07 +0200 Message-Id: <20190609164147.943020718@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164147.729157653@linuxfoundation.org> References: <20190609164147.729157653@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric Biggers commit 307508d1072979f4435416f87936f87eaeb82054 upstream. The ->digest() method of crct10dif-generic reads the current CRC value from the shash_desc context. But this value is uninitialized, causing crypto_shash_digest() to compute the wrong result. Fix it. Probably this wasn't noticed before because lib/crc-t10dif.c only uses crypto_shash_update(), not crypto_shash_digest(). Likewise, crypto_shash_digest() is not yet tested by the crypto self-tests because those only test the ahash API which only uses shash init/update/final. This bug was detected by my patches that improve testmgr to fuzz algorithms against their generic implementation. Fixes: 2d31e518a428 ("crypto: crct10dif - Wrap crc_t10dif function all to use crypto transform framework") Cc: # v3.11+ Cc: Tim Chen Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- crypto/crct10dif_generic.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) --- a/crypto/crct10dif_generic.c +++ b/crypto/crct10dif_generic.c @@ -65,10 +65,9 @@ static int chksum_final(struct shash_des return 0; } -static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len, - u8 *out) +static int __chksum_finup(__u16 crc, const u8 *data, unsigned int len, u8 *out) { - *(__u16 *)out = crc_t10dif_generic(*crcp, data, len); + *(__u16 *)out = crc_t10dif_generic(crc, data, len); return 0; } @@ -77,15 +76,13 @@ static int chksum_finup(struct shash_des { struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - return __chksum_finup(&ctx->crc, data, len, out); + return __chksum_finup(ctx->crc, data, len, out); } static int chksum_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out) { - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - return __chksum_finup(&ctx->crc, data, length, out); + return __chksum_finup(0, data, length, out); } static struct shash_alg alg = {