From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753116AbbHMOsU (ORCPT ); Thu, 13 Aug 2015 10:48:20 -0400 Received: from mail-wi0-f176.google.com ([209.85.212.176]:37981 "EHLO mail-wi0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752790AbbHMOsQ (ORCPT ); Thu, 13 Aug 2015 10:48:16 -0400 From: Robert Richter To: Marc Zygnier , Thomas Gleixner , Jason Cooper Cc: Tirumalesh Chalamarla , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Robert Richter Subject: [PATCH v2 1/5] arm64: gicv3: its: Add range check for number of allocated pages Date: Thu, 13 Aug 2015 16:47:53 +0200 Message-Id: <1439477277-6157-2-git-send-email-rric@kernel.org> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1439477277-6157-1-git-send-email-rric@kernel.org> References: <1439477277-6157-1-git-send-email-rric@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Robert Richter The number of pages for the its table may exceed the maximum of 256. Adding a range check and limitting the number to its maximum. Based on a patch from Tirumalesh Chalamarla . Signed-off-by: Tirumalesh Chalamarla Reviewed-by: Marc Zyngier Signed-off-by: Robert Richter --- drivers/irqchip/irq-gic-v3-its.c | 11 ++++++++++- include/linux/irqchip/arm-gic-v3.h | 1 + 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 1b7e155869f6..466edf8a7477 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -810,6 +810,7 @@ static int its_alloc_tables(struct its_node *its) u64 entry_size = GITS_BASER_ENTRY_SIZE(val); int order = get_order(psz); int alloc_size; + int alloc_pages; u64 tmp; void *base; @@ -844,6 +845,14 @@ static int its_alloc_tables(struct its_node *its) } alloc_size = (1 << order) * PAGE_SIZE; + alloc_pages = (alloc_size / psz); + if (alloc_pages > GITS_BASER_PAGES_MAX) { + alloc_pages = GITS_BASER_PAGES_MAX; + order = get_order(GITS_BASER_PAGES_MAX * psz); + pr_warn("%s: Device Table too large, reduce its page order to %u (%u pages)\n", + its->msi_chip.of_node->full_name, order, alloc_pages); + } + base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); if (!base) { err = -ENOMEM; @@ -872,7 +881,7 @@ static int its_alloc_tables(struct its_node *its) break; } - val |= (alloc_size / psz) - 1; + val |= alloc_pages - 1; writeq_relaxed(val, its->base + GITS_BASER + i * 8); tmp = readq_relaxed(its->base + GITS_BASER + i * 8); diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h index ffbc034c8810..f28da189c4aa 100644 --- a/include/linux/irqchip/arm-gic-v3.h +++ b/include/linux/irqchip/arm-gic-v3.h @@ -229,6 +229,7 @@ #define GITS_BASER_PAGE_SIZE_16K (1UL << GITS_BASER_PAGE_SIZE_SHIFT) #define GITS_BASER_PAGE_SIZE_64K (2UL << GITS_BASER_PAGE_SIZE_SHIFT) #define GITS_BASER_PAGE_SIZE_MASK (3UL << GITS_BASER_PAGE_SIZE_SHIFT) +#define GITS_BASER_PAGES_MAX 256 #define GITS_BASER_TYPE_NONE 0 #define GITS_BASER_TYPE_DEVICE 1 -- 2.1.1