From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753970AbaIWCgy (ORCPT ); Mon, 22 Sep 2014 22:36:54 -0400 Received: from mail.kernel.org ([198.145.19.201]:37848 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750917AbaIWCgv (ORCPT ); Mon, 22 Sep 2014 22:36:51 -0400 From: Zefan Li To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Alan Douglas , Max Filippov , Zefan Li Subject: [PATCH 3.4 15/45] xtensa: fix address checks in dma_{alloc,free}_coherent Date: Tue, 23 Sep 2014 10:31:17 +0800 Message-Id: <1411439507-30391-15-git-send-email-lizf@kernel.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1411439259-30224-1-git-send-email-lizf@kernel.org> References: <1411439259-30224-1-git-send-email-lizf@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alan Douglas 3.4.104-rc1 review patch. If anyone has any objections, please let me know. ------------------ commit 1ca49463c44c970b1ab1d71b0f268bfdf8427a7e upstream. Virtual address is translated to the XCHAL_KSEG_CACHED region in the dma_free_coherent, but is checked to be in the 0...XCHAL_KSEG_SIZE range. Change check for end of the range from 'addr >= X' to 'addr > X - 1' to handle the case of X == 0. Replace 'if (C) BUG();' construct with 'BUG_ON(C);'. Signed-off-by: Alan Douglas Signed-off-by: Max Filippov Signed-off-by: Zefan Li --- arch/xtensa/kernel/pci-dma.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c index 2783fda..c055c91 100644 --- a/arch/xtensa/kernel/pci-dma.c +++ b/arch/xtensa/kernel/pci-dma.c @@ -48,9 +48,8 @@ dma_alloc_coherent(struct device *dev,size_t size,dma_addr_t *handle,gfp_t flag) /* We currently don't support coherent memory outside KSEG */ - if (ret < XCHAL_KSEG_CACHED_VADDR - || ret >= XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE) - BUG(); + BUG_ON(ret < XCHAL_KSEG_CACHED_VADDR || + ret > XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE - 1); if (ret != 0) { @@ -66,10 +65,11 @@ dma_alloc_coherent(struct device *dev,size_t size,dma_addr_t *handle,gfp_t flag) void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle) { - long addr=(long)vaddr+XCHAL_KSEG_CACHED_VADDR-XCHAL_KSEG_BYPASS_VADDR; + unsigned long addr = (unsigned long)vaddr + + XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR; - if (addr < 0 || addr >= XCHAL_KSEG_SIZE) - BUG(); + BUG_ON(addr < XCHAL_KSEG_CACHED_VADDR || + addr > XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE - 1); free_pages(addr, get_order(size)); } -- 1.7.9.5