From patchwork Wed Feb 26 04:59:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 198046 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 2F269C4BA11 for ; Wed, 26 Feb 2020 05:01:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 062422067C for ; Wed, 26 Feb 2020 05:01:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582693263; bh=PttdxIj3lqzreG0Wccf68PsarfLwS7UolPyxX7OQSjw=; h=From:To:Subject:Date:In-Reply-To:References:List-ID:From; b=16Zab3dH7yfe5gDLwu8IVURSsbYgsF2gnZCQygppUChn17oMr3YKqfAOubCgXqgaZ EyUTMyjZrfhj2vYgWEAi3xfpCeSC+H8p0KXCoyFP+B1yw9Str3tKa0EAGVlnq72XU+ RmYuhQAkJmNTpPled3hE193SDNLpV/ks3U4E0glo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726407AbgBZFBC (ORCPT ); Wed, 26 Feb 2020 00:01:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:50558 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725916AbgBZFBB (ORCPT ); Wed, 26 Feb 2020 00:01:01 -0500 Received: from sol.hsd1.ca.comcast.net (c-107-3-166-239.hsd1.ca.comcast.net [107.3.166.239]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7CBCF222C2 for ; Wed, 26 Feb 2020 05:01:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582693260; bh=PttdxIj3lqzreG0Wccf68PsarfLwS7UolPyxX7OQSjw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=F2gBKORdDf9eEmiGMG51XBIlc6U2IfGSVx6uv9E0PTwlZW5TH/lRpdQbORYRj3tkI zTm4XLcgH1eipH5mratPnATl3uj7DxTkj1bdIU0RpZInYG1b00KZ9PAMPnvQG45nH2 3OlTX+CuAtWoAw6jAA769fNmExfQ4KK6KBty6SMg= From: Eric Biggers To: linux-crypto@vger.kernel.org Subject: [PATCH 04/12] crypto: ctr - simplify error handling in crypto_rfc3686_create() Date: Tue, 25 Feb 2020 20:59:16 -0800 Message-Id: <20200226045924.97053-5-ebiggers@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200226045924.97053-1-ebiggers@kernel.org> References: <20200226045924.97053-1-ebiggers@kernel.org> MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Eric Biggers Simplify the error handling in crypto_rfc3686_create() by taking advantage of crypto_grab_skcipher() now handling an ERR_PTR() name and by taking advantage of crypto_drop_skcipher() now accepting (as a no-op) a spawn that hasn't been grabbed yet. Signed-off-by: Eric Biggers --- crypto/ctr.c | 29 +++++++++-------------------- 1 file changed, 9 insertions(+), 20 deletions(-) diff --git a/crypto/ctr.c b/crypto/ctr.c index a8feab621c6c1..31ac4ae598e17 100644 --- a/crypto/ctr.c +++ b/crypto/ctr.c @@ -260,7 +260,6 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, struct skcipher_instance *inst; struct skcipher_alg *alg; struct crypto_skcipher_spawn *spawn; - const char *cipher_name; u32 mask; int err; @@ -272,10 +271,6 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) return -EINVAL; - cipher_name = crypto_attr_alg_name(tb[1]); - if (IS_ERR(cipher_name)) - return PTR_ERR(cipher_name); - inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) return -ENOMEM; @@ -287,7 +282,7 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, spawn = skcipher_instance_ctx(inst); err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst), - cipher_name, 0, mask); + crypto_attr_alg_name(tb[1]), 0, mask); if (err) goto err_free_inst; @@ -296,20 +291,20 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, /* We only support 16-byte blocks. */ err = -EINVAL; if (crypto_skcipher_alg_ivsize(alg) != CTR_RFC3686_BLOCK_SIZE) - goto err_drop_spawn; + goto err_free_inst; /* Not a stream cipher? */ if (alg->base.cra_blocksize != 1) - goto err_drop_spawn; + goto err_free_inst; err = -ENAMETOOLONG; if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, "rfc3686(%s)", alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) - goto err_drop_spawn; + goto err_free_inst; if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "rfc3686(%s)", alg->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) - goto err_drop_spawn; + goto err_free_inst; inst->alg.base.cra_priority = alg->base.cra_priority; inst->alg.base.cra_blocksize = 1; @@ -336,17 +331,11 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl, inst->free = crypto_rfc3686_free; err = skcipher_register_instance(tmpl, inst); - if (err) - goto err_drop_spawn; - -out: - return err; - -err_drop_spawn: - crypto_drop_skcipher(spawn); + if (err) { err_free_inst: - kfree(inst); - goto out; + crypto_rfc3686_free(inst); + } + return err; } static struct crypto_template crypto_ctr_tmpls[] = {