From patchwork Tue Oct 26 21:41:28 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 284032 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id o9QLgtWR010679 for ; Tue, 26 Oct 2010 21:42:55 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753370Ab0JZVlb (ORCPT ); Tue, 26 Oct 2010 17:41:31 -0400 Received: from g5t0009.atlanta.hp.com ([15.192.0.46]:14079 "EHLO g5t0009.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932490Ab0JZVl3 (ORCPT ); Tue, 26 Oct 2010 17:41:29 -0400 Received: from g5t0029.atlanta.hp.com (g5t0029.atlanta.hp.com [16.228.8.141]) by g5t0009.atlanta.hp.com (Postfix) with ESMTP id 65C13301D4; Tue, 26 Oct 2010 21:41:29 +0000 (UTC) Received: from ldl (ldl.usa.hp.com [16.125.112.222]) by g5t0029.atlanta.hp.com (Postfix) with ESMTP id 255E1200D8; Tue, 26 Oct 2010 21:41:29 +0000 (UTC) Received: from localhost (ldl.fc.hp.com [127.0.0.1]) by ldl (Postfix) with ESMTP id F1658CF0013; Tue, 26 Oct 2010 15:41:28 -0600 (MDT) Received: from ldl ([127.0.0.1]) by localhost (ldl.fc.hp.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8L3oi0K7Dqai; Tue, 26 Oct 2010 15:41:28 -0600 (MDT) Received: from eh.fc.hp.com (bob.lnx.usa.hp.com [16.125.112.218]) by ldl (Postfix) with ESMTP id D483BCF0012; Tue, 26 Oct 2010 15:41:28 -0600 (MDT) Received: from bob.kio (localhost [127.0.0.1]) by eh.fc.hp.com (Postfix) with ESMTP id BD2F2260EB; Tue, 26 Oct 2010 15:41:28 -0600 (MDT) Subject: [PATCH v5 4/9] resources: handle overflow when aligning start of available area To: Jesse Barnes From: Bjorn Helgaas Cc: Bob Picco , Brian Bloniarz , Charles Butterfield , Denys Vlasenko , Ingo Molnar , linux-pci@vger.kernel.org, "Horst H. von Brand" , "H. Peter Anvin" , linux-kernel@vger.kernel.org, Stefan Becker , Chuck Ebbert , Fabrice Bellet , Yinghai Lu , Leann Ogasawara , Linus Torvalds , Thomas Gleixner Date: Tue, 26 Oct 2010 15:41:28 -0600 Message-ID: <20101026214128.29808.77226.stgit@bob.kio> In-Reply-To: <20101026214033.29808.15272.stgit@bob.kio> References: <20101026214033.29808.15272.stgit@bob.kio> User-Agent: StGit/0.15 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Tue, 26 Oct 2010 21:42:56 +0000 (UTC) diff --git a/kernel/resource.c b/kernel/resource.c index 89d5041..e15b922 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -392,7 +392,7 @@ static int find_resource(struct resource *root, struct resource *new, void *alignf_data) { struct resource *this = root->child; - struct resource tmp = *new, alloc; + struct resource tmp = *new, avail, alloc; tmp.start = root->start; /* @@ -410,14 +410,19 @@ static int find_resource(struct resource *root, struct resource *new, tmp.end = root->end; resource_clip(&tmp, min, max); - tmp.start = ALIGN(tmp.start, align); - alloc.start = alignf(alignf_data, &tmp, size, align); - alloc.end = alloc.start + size - 1; - if (resource_contains(&tmp, &alloc)) { - new->start = alloc.start; - new->end = alloc.end; - return 0; + /* Check for overflow after ALIGN() */ + avail = *new; + avail.start = ALIGN(tmp.start, align); + avail.end = tmp.end; + if (avail.start >= tmp.start) { + alloc.start = alignf(alignf_data, &avail, size, align); + alloc.end = alloc.start + size - 1; + if (resource_contains(&avail, &alloc)) { + new->start = alloc.start; + new->end = alloc.end; + return 0; + } } if (!this) break;