From patchwork Tue Mar 2 16:34:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 392869 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 9BD4AC4361B for ; Wed, 3 Mar 2021 01:42:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D2AF64E09 for ; Wed, 3 Mar 2021 01:42:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237381AbhCCBfK (ORCPT ); Tue, 2 Mar 2021 20:35:10 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:60619 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1579468AbhCBQ60 (ORCPT ); Tue, 2 Mar 2021 11:58:26 -0500 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1lH7yx-0008WF-5K; Tue, 02 Mar 2021 16:34:47 +0000 From: Colin King To: Corentin Labbe , Herbert Xu , "David S . Miller" , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec , linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] crypto: sun8i-ss: Fix memory leak of object d when dma_iv fails to map Date: Tue, 2 Mar 2021 16:34:46 +0000 Message-Id: <20210302163446.21047-1-colin.king@canonical.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Colin Ian King In the case where the dma_iv mapping fails, the return error path leaks the memory allocated to object d. Fix this by adding a new error return label and jumping to this to ensure d is free'd before the return. Addresses-Coverity: ("Resource leak") Fixes: ac2614d721de ("crypto: sun8i-ss - Add support for the PRNG") Signed-off-by: Colin Ian King Tested-by: Corentin Labbe Acked-by: Corentin Labbe --- drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c index 08a1473b2145..3191527928e4 100644 --- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c +++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c @@ -103,7 +103,8 @@ int sun8i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src, dma_iv = dma_map_single(ss->dev, ctx->seed, ctx->slen, DMA_TO_DEVICE); if (dma_mapping_error(ss->dev, dma_iv)) { dev_err(ss->dev, "Cannot DMA MAP IV\n"); - return -EFAULT; + err = -EFAULT; + goto err_free; } dma_dst = dma_map_single(ss->dev, d, todo, DMA_FROM_DEVICE); @@ -167,6 +168,7 @@ int sun8i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src, memcpy(ctx->seed, d + dlen, ctx->slen); } memzero_explicit(d, todo); +err_free: kfree(d); return err;