Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757517AbaJCWF7 (ORCPT ); Fri, 3 Oct 2014 18:05:59 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:46353 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752322AbaJCWEB (ORCPT ); Fri, 3 Oct 2014 18:04:01 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xishi Qiu , Tang Chen , Andrew Morton , Linus Torvalds Subject: [PATCH 3.14 123/238] memblock, memhotplug: fix wrong type in memblock_find_in_range_node(). Date: Fri, 3 Oct 2014 14:30:38 -0700 Message-Id: <20141003212917.615672620@linuxfoundation.org> X-Mailer: git-send-email 2.1.2 In-Reply-To: <20141003212913.680985295@linuxfoundation.org> References: <20141003212913.680985295@linuxfoundation.org> User-Agent: quilt/0.63-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tang Chen commit 0cfb8f0c3e21e36d4a6e472e4c419d58ba848698 upstream. In memblock_find_in_range_node(), we defined ret as int. But it should be phys_addr_t because it is used to store the return value from __memblock_find_range_bottom_up(). The bug has not been triggered because when allocating low memory near the kernel end, the "int ret" won't turn out to be negative. When we started to allocate memory on other nodes, and the "int ret" could be minus. Then the kernel will panic. A simple way to reproduce this: comment out the following code in numa_init(), memblock_set_bottom_up(false); and the kernel won't boot. Reported-by: Xishi Qiu Signed-off-by: Tang Chen Tested-by: Xishi Qiu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- mm/memblock.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/mm/memblock.c +++ b/mm/memblock.c @@ -183,8 +183,7 @@ phys_addr_t __init_memblock memblock_fin phys_addr_t align, phys_addr_t start, phys_addr_t end, int nid) { - int ret; - phys_addr_t kernel_end; + phys_addr_t kernel_end, ret; /* pump up @end */ if (end == MEMBLOCK_ALLOC_ACCESSIBLE) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/