From patchwork Wed May 12 14:44:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 437045 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=-19.4 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 86DFAC43619 for ; Wed, 12 May 2021 15:28:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5607361C28 for ; Wed, 12 May 2021 15:28:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232969AbhELP2w (ORCPT ); Wed, 12 May 2021 11:28:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:57412 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232808AbhELPWQ (ORCPT ); Wed, 12 May 2021 11:22:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D9A8661963; Wed, 12 May 2021 15:09:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620832146; bh=VdG7MfJyAOQlxsgl3SvZay79iRjHCdkdkkJTjITfmNw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oc/zHxjfhI6079Es7N/RPjtBhgfb2/GuDi1tPX8sgKO2+2RBkRZrCREt6UBpwQSf3 J+uNN6MvMa+y5N8H2wgVJxYpVDd1Sfa37r7nUKwWL8T1GDKbcbm89GP5kpUIJIbsTB uCfHsQqoHwEXnSR+PCHg21MGxu5OHajq1qhJcLh0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Corentin Labbe , Herbert Xu , Sasha Levin Subject: [PATCH 5.10 161/530] crypto: sun8i-ss - Fix memory leak of object d when dma_iv fails to map Date: Wed, 12 May 2021 16:44:31 +0200 Message-Id: <20210512144825.130747288@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144819.664462530@linuxfoundation.org> References: <20210512144819.664462530@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Colin Ian King [ Upstream commit 98b5ef3e97b16eaeeedb936f8bda3594ff84a70e ] 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 Acked-by: Corentin Labbe Tested-by: Corentin Labbe Acked-by: Corentin Labbe Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- 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 @@ err_iv: memcpy(ctx->seed, d + dlen, ctx->slen); } memzero_explicit(d, todo); +err_free: kfree(d); return err;