From patchwork Thu Jan 20 07:08:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Guangming.Cao" X-Patchwork-Id: 12718350 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 73DBCC433F5 for ; Thu, 20 Jan 2022 07:19:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=53tRPQnQ1lomBGjbbWVa4P3YYXBJWrJwgSx7kqH0cEs=; b=MzebQOGfpl6szd KSOSNYzzDiLL9xAt3QLhJDLs8PiOkSGB+/lMFjA6VUmQtx0o725+WR8NF6K+uM1FaRUfnScDrx855 JJs8YkHSz5+HbXRKDeUj2btQj0h0TPsMoeIV+e6QeMftLofjgbEVbO90PlEEy+Lv5IXsqUWhhWxj7 J3HbuEf5zzjy+Bpod4aDECkjIpCeL/Z+vCQk4YTquhK3B2kLIFcKTPvudmzuxi1HT9FV0N4E+iaal q6AGciEJt1ew+RJZQ2eyn6E8NQfggnFHK3DsdGzuXPLlNIlR34Lwpc6Bx5ffs26ZhO+wYtMq4VfK3 HCHcOtIY6iGp4e5SWhVg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nARhx-009I79-En; Thu, 20 Jan 2022 07:18:09 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nARht-009I68-19; Thu, 20 Jan 2022 07:18:06 +0000 X-UUID: 098846d287944148ae2ec437733ab97d-20220120 X-UUID: 098846d287944148ae2ec437733ab97d-20220120 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 526460845; Thu, 20 Jan 2022 00:18:02 -0700 Received: from mtkexhb01.mediatek.inc (172.21.101.102) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 19 Jan 2022 23:08:00 -0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkexhb01.mediatek.inc (172.21.101.102) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 20 Jan 2022 15:07:53 +0800 Received: from mszswglt01.gcn.mediatek.inc (10.16.20.20) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 20 Jan 2022 15:07:52 +0800 From: To: CC: , , , , , , , , , , , , , , , , , , , , , Guangming Subject: [PATCH v5] dma-buf: system_heap: Add a size check for allocation Date: Thu, 20 Jan 2022 15:08:50 +0800 Message-ID: <20220120070850.95495-1-guangming.cao@mediatek.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220119_231805_085905_5B93791D X-CRM114-Status: GOOD ( 12.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Guangming Add a size check for allocation since the allocation size should be always less than the total DRAM size on system heap. Adding this check can prevent comsuming too much time for invalid allocations. Signed-off-by: Guangming --- drivers/dma-buf/heaps/system_heap.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index 23a7e74ef966..459dc18bc4a2 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -347,6 +347,14 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap, struct page *page, *tmp_page; int i, ret = -ENOMEM; + /* + * Size check. The "len" should be less than totalram since system_heap + * memory is comes from system. Adding check here can prevent comsuming + * too much time for invalid allocations. + */ + if (len >> PAGE_SHIFT > totalram_pages()) + return ERR_PTR(-EINVAL); + buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); if (!buffer) return ERR_PTR(-ENOMEM);