/* * mm/kmemleak-test.c * * Copyright (C) 2008 ARM Limited * Written by Catalin Marinas * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #define pr_fmt(fmt) "kmemleak: " fmt #include #include #include #include #include #include #include #include #include struct test_node { long header[25]; struct list_head list; long footer[25]; }; static LIST_HEAD(test_list); static DEFINE_PER_CPU(void *, kmemleak_test_pointer); /* * Some very simple testing. This function needs to be extended for * proper testing. */ static int __init kmemleak_test_init(void) { struct test_node *elem; int i; pr_info("Kmemleak testing\n"); /* make some orphan objects */ pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); #ifndef CONFIG_MODULES pr_info("kmem_cache_alloc(files_cachep) = %p\n", kmem_cache_alloc(files_cachep, GFP_KERNEL)); pr_info("kmem_cache_alloc(files_cachep) = %p\n", kmem_cache_alloc(files_cachep, GFP_KERNEL)); #endif pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); pr_info("vmalloc(64) = %p\n", vmalloc(64)); /* * Add elements to a list. They should only appear as orphan * after the module is removed. */ for (i = 0; i < 10; i++) { elem = kzalloc(sizeof(*elem), GFP_KERNEL); pr_info("kzalloc(sizeof(*elem)) = %p\n", elem); if (!elem) return -ENOMEM; INIT_LIST_HEAD(&elem->list); list_add_tail(&elem->list, &test_list); } for_each_possible_cpu(i) { per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL); pr_info("kmalloc(129) = %p\n", per_cpu(kmemleak_test_pointer, i)); } return 0; } module_init(kmemleak_test_init); static void __exit kmemleak_test_exit(void) { struct test_node *elem, *tmp; /* * Remove the list elements without actually freeing the * memory. */ list_for_each_entry_safe(elem, tmp, &test_list, list) list_del(&elem->list); } module_exit(kmemleak_test_exit); MODULE_LICENSE("GPL"); 8d74b02d0a143'/>
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/tipc/sysctl.c
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/tipc/sysctl.c')