From patchwork Fri Jun 23 21:14:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julia Lawall X-Patchwork-Id: 696103 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17C3EEB64D7 for ; Fri, 23 Jun 2023 21:20:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231954AbjFWVUg (ORCPT ); Fri, 23 Jun 2023 17:20:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233083AbjFWVUA (ORCPT ); Fri, 23 Jun 2023 17:20:00 -0400 Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6390F4214 for ; Fri, 23 Jun 2023 14:19:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=inria.fr; s=dc; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=v1C6X9Yx4yVXOAdKb8gSIcJ1cJexwLFD0Mhp8hyTXpM=; b=ibGdS6fGsGhc/uttTGaoiJpbUVLv1dQE53RQlyqWPi8I8jYsjA4QPhsG 69vuLyA1lvbPNf9DFQ9xV+59969GQRIT64vAPf+BtV5VoJBI5MAp5KGAg 4j/AIfruYXqvPQ99dB1Q5fqTn+WPSuJXNvhdtCBICTm1jBC06qptZY2WA c=; Authentication-Results: mail3-relais-sop.national.inria.fr; dkim=none (message not signed) header.i=none; spf=SoftFail smtp.mailfrom=Julia.Lawall@inria.fr; dmarc=fail (p=none dis=none) d=inria.fr X-IronPort-AV: E=Sophos;i="6.01,153,1684792800"; d="scan'208";a="59686164" Received: from i80.paris.inria.fr (HELO i80.paris.inria.fr.) ([128.93.90.48]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jun 2023 23:15:10 +0200 From: Julia Lawall To: Sumit Semwal Cc: keescook@chromium.org, kernel-janitors@vger.kernel.org, Benjamin Gaignard , Liam Mark , Laura Abbott , Brian Starkey , John Stultz , =?utf-8?q?Christian_K=C3=B6nig?= , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/26] dma-buf: system_heap: use array_size Date: Fri, 23 Jun 2023 23:14:37 +0200 Message-Id: <20230623211457.102544-7-Julia.Lawall@inria.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230623211457.102544-1-Julia.Lawall@inria.fr> References: <20230623211457.102544-1-Julia.Lawall@inria.fr> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Use array_size to protect against multiplication overflows. The changes were done using the following Coccinelle semantic patch: // @@ size_t e1,e2; expression COUNT; identifier alloc = {vmalloc,vzalloc,kvmalloc,kvzalloc}; @@ ( alloc( - (e1) * (e2) + array_size(e1, e2) ,...) | alloc( - (e1) * (COUNT) + array_size(COUNT, e1) ,...) ) // Signed-off-by: Julia Lawall --- drivers/dma-buf/heaps/system_heap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index ee7059399e9c..fb7867599874 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -221,7 +221,7 @@ static void *system_heap_do_vmap(struct system_heap_buffer *buffer) { struct sg_table *table = &buffer->sg_table; int npages = PAGE_ALIGN(buffer->len) / PAGE_SIZE; - struct page **pages = vmalloc(sizeof(struct page *) * npages); + struct page **pages = vmalloc(array_size(npages, sizeof(struct page *))); struct page **tmp = pages; struct sg_page_iter piter; void *vaddr;