/* Copyright (c) 2016 Facebook * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #define KBUILD_MODNAME "foo" #include #include #include #include #include #include "bpf_helpers.h" /* copy of 'struct ethhdr' without __packed */ struct eth_hdr { unsigned char h_dest[ETH_ALEN]; unsigned char h_source[ETH_ALEN]; unsigned short h_proto; }; #define PIN_GLOBAL_NS 2 struct bpf_elf_map { __u32 type; __u32 size_key; __u32 size_value; __u32 max_elem; __u32 flags; __u32 id; __u32 pinning; }; struct bpf_elf_map SEC("maps") test_cgrp2_array_pin = { .type = BPF_MAP_TYPE_CGROUP_ARRAY, .size_key = sizeof(uint32_t), .size_value = sizeof(uint32_t), .pinning = PIN_GLOBAL_NS, .max_elem = 1, }; SEC("filter") int handle_egress(struct __sk_buff *skb) { void *data = (void *)(long)skb->data; struct eth_hdr *eth = data; struct ipv6hdr *ip6h = data + sizeof(*eth); void *data_end = (void *)(long)skb->data_end; char dont_care_msg[] = "dont care %04x %d\n"; char pass_msg[] = "pass\n"; char reject_msg[] = "reject\n"; /* single length check */ if (data + sizeof(*eth) + sizeof(*ip6h) > data_end) return TC_ACT_OK; if (eth->h_proto != htons(ETH_P_IPV6) || ip6h->nexthdr != IPPROTO_ICMPV6) { bpf_trace_printk(dont_care_msg, sizeof(dont_care_msg), eth->h_proto, ip6h->nexthdr); return TC_ACT_OK; } else if (bpf_skb_under_cgroup(skb, &test_cgrp2_array_pin, 0) != 1) { bpf_trace_printk(pass_msg, sizeof(pass_msg)); return TC_ACT_OK; } else { bpf_trace_printk(reject_msg, sizeof(reject_msg)); return TC_ACT_SHOT; } } char _license[] SEC("license") = "GPL"; d69fc6963c16003f50d7e8d74b02d0a143'>treecommitdiff
path: root/net/batman-adv/bat_v_elp.c
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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/batman-adv/bat_v_elp.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/batman-adv/bat_v_elp.c')