From patchwork Wed Apr 29 15:09:18 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dean Nelson X-Patchwork-Id: 6296791 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 05BBCBEEE1 for ; Wed, 29 Apr 2015 15:11:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4466F20148 for ; Wed, 29 Apr 2015 15:11:52 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6E59120145 for ; Wed, 29 Apr 2015 15:11:51 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YnTcU-0001MS-Tv; Wed, 29 Apr 2015 15:09:50 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YnTcJ-0001CM-Vi for linux-arm-kernel@lists.infradead.org; Wed, 29 Apr 2015 15:09:40 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 0167B8EFF8; Wed, 29 Apr 2015 15:09:18 +0000 (UTC) Received: from [192.168.1.100] (ovpn-113-108.phx2.redhat.com [10.3.113.108]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t3TF9Ixc006616; Wed, 29 Apr 2015 11:09:18 -0400 Date: Wed, 29 Apr 2015 11:09:18 -0400 From: Dean Nelson To: linux-arm-kernel@lists.infradead.org Message-Id: <20150429150917.14395.31269.email-sent-by-dnelson@teal> Subject: [PATCH] arm64: add missing PAGE_ALIGN() to __dma_free() X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150429_080940_079748_2528A9A8 X-CRM114-Status: GOOD ( 10.45 ) X-Spam-Score: -5.0 (-----) Cc: Catalin Marinas , Will Deacon X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP __dma_alloc() does a PAGE_ALIGN() on the passed in size argument before doing anything else. __dma_free() does not. And because it doesn't, it is possible to leak memory should size not be an integer multiple of PAGE_SIZE. The solution is to add a PAGE_ALIGN() to __dma_free() like is done in __dma_alloc(). Additionally, this patch removes a redundant PAGE_ALIGN() from __dma_alloc_coherent(), since __dma_alloc_coherent() can only be called from __dma_alloc(), which already does a PAGE_ALIGN() before the call. Signed-off-by: Dean Nelson Cc: stable@vger.kernel.org Acked-by: Catalin Marinas --- arch/arm64/mm/dma-mapping.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index ef7d112..6e5e687 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -105,7 +105,6 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size, struct page *page; void *addr; - size = PAGE_ALIGN(size); page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, get_order(size)); if (!page) @@ -195,6 +194,8 @@ static void __dma_free(struct device *dev, size_t size, { void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle)); + size = PAGE_ALIGN(size); + if (!is_device_dma_coherent(dev)) { if (__free_from_pool(vaddr, size)) return;