linux/net/netrom/sysctl_net_netrom.c
YueHaibing d3706566ae net: netrom: Fix error cleanup path of nr_proto_init
Syzkaller report this:

BUG: unable to handle kernel paging request at fffffbfff830524b
PGD 237fe8067 P4D 237fe8067 PUD 237e64067 PMD 1c9716067 PTE 0
Oops: 0000 [#1] SMP KASAN PTI
CPU: 1 PID: 4465 Comm: syz-executor.0 Not tainted 5.0.0+ #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
RIP: 0010:__list_add_valid+0x21/0xe0 lib/list_debug.c:23
Code: 8b 0c 24 e9 17 fd ff ff 90 55 48 89 fd 48 8d 7a 08 53 48 89 d3 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 48 83 ec 08 <80> 3c 02 00 0f 85 8b 00 00 00 48 8b 53 08 48 39 f2 75 35 48 89 f2
RSP: 0018:ffff8881ea2278d0 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffffffffc1829250 RCX: 1ffff1103d444ef4
RDX: 1ffffffff830524b RSI: ffffffff85659300 RDI: ffffffffc1829258
RBP: ffffffffc1879250 R08: fffffbfff0acb269 R09: fffffbfff0acb269
R10: ffff8881ea2278f0 R11: fffffbfff0acb268 R12: ffffffffc1829250
R13: dffffc0000000000 R14: 0000000000000008 R15: ffffffffc187c830
FS:  00007fe0361df700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff830524b CR3: 00000001eb39a001 CR4: 00000000007606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 __list_add include/linux/list.h:60 [inline]
 list_add include/linux/list.h:79 [inline]
 proto_register+0x444/0x8f0 net/core/sock.c:3375
 nr_proto_init+0x73/0x4b3 [netrom]
 ? 0xffffffffc1628000
 ? 0xffffffffc1628000
 do_one_initcall+0xbc/0x47d init/main.c:887
 do_init_module+0x1b5/0x547 kernel/module.c:3456
 load_module+0x6405/0x8c10 kernel/module.c:3804
 __do_sys_finit_module+0x162/0x190 kernel/module.c:3898
 do_syscall_64+0x9f/0x450 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x462e99
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe0361dec58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 000000000073bf00 RCX: 0000000000462e99
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 00007fe0361dec70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe0361df6bc
R13: 00000000004bcefa R14: 00000000006f6fb0 R15: 0000000000000004
Modules linked in: netrom(+) ax25 fcrypt pcbc af_alg arizona_ldo1 v4l2_common videodev media v4l2_dv_timings hdlc ide_cd_mod snd_soc_sigmadsp_regmap snd_soc_sigmadsp intel_spi_platform intel_spi mtd spi_nor snd_usbmidi_lib usbcore lcd ti_ads7950 hi6421_regulator snd_soc_kbl_rt5663_max98927 snd_soc_hdac_hdmi snd_hda_ext_core snd_hda_core snd_soc_rt5663 snd_soc_core snd_pcm_dmaengine snd_compress snd_soc_rl6231 mac80211 rtc_rc5t583 spi_slave_time leds_pwm hid_gt683r hid industrialio_triggered_buffer kfifo_buf industrialio ir_kbd_i2c rc_core led_class_flash dwc_xlgmac snd_ymfpci gameport snd_mpu401_uart snd_rawmidi snd_ac97_codec snd_pcm ac97_bus snd_opl3_lib snd_timer snd_seq_device snd_hwdep snd soundcore iptable_security iptable_raw iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_filter bpfilter ip6_vti ip_vti ip_gre ipip sit tunnel4 ip_tunnel hsr veth netdevsim vxcan batman_adv cfg80211 rfkill chnl_net caif nlmon dummy team bonding vcan
 bridge stp llc ip6_gre gre ip6_tunnel tunnel6 tun joydev mousedev ppdev tpm kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ide_pci_generic piix aesni_intel aes_x86_64 crypto_simd cryptd glue_helper ide_core psmouse input_leds i2c_piix4 serio_raw intel_agp intel_gtt ata_generic agpgart pata_acpi parport_pc rtc_cmos parport floppy sch_fq_codel ip_tables x_tables sha1_ssse3 sha1_generic ipv6 [last unloaded: rxrpc]
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: fffffbfff830524b
---[ end trace 039ab24b305c4b19 ]---

If nr_proto_init failed, it may forget to call proto_unregister,
tiggering this issue.This patch rearrange code of nr_proto_init
to avoid such issues.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-11 13:59:49 -07:00

161 lines
4.2 KiB
C

/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Copyright (C) 1996 Mike Shaver (shaver@zeroknowledge.com)
*/
#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/init.h>
#include <net/ax25.h>
#include <net/netrom.h>
/*
* Values taken from NET/ROM documentation.
*/
static int min_quality[] = {0}, max_quality[] = {255};
static int min_obs[] = {0}, max_obs[] = {255};
static int min_ttl[] = {0}, max_ttl[] = {255};
static int min_t1[] = {5 * HZ};
static int max_t1[] = {600 * HZ};
static int min_n2[] = {2}, max_n2[] = {127};
static int min_t2[] = {1 * HZ};
static int max_t2[] = {60 * HZ};
static int min_t4[] = {1 * HZ};
static int max_t4[] = {1000 * HZ};
static int min_window[] = {1}, max_window[] = {127};
static int min_idle[] = {0 * HZ};
static int max_idle[] = {65535 * HZ};
static int min_route[] = {0}, max_route[] = {1};
static int min_fails[] = {1}, max_fails[] = {10};
static int min_reset[] = {0}, max_reset[] = {1};
static struct ctl_table_header *nr_table_header;
static struct ctl_table nr_table[] = {
{
.procname = "default_path_quality",
.data = &sysctl_netrom_default_path_quality,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_quality,
.extra2 = &max_quality
},
{
.procname = "obsolescence_count_initialiser",
.data = &sysctl_netrom_obsolescence_count_initialiser,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_obs,
.extra2 = &max_obs
},
{
.procname = "network_ttl_initialiser",
.data = &sysctl_netrom_network_ttl_initialiser,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_ttl,
.extra2 = &max_ttl
},
{
.procname = "transport_timeout",
.data = &sysctl_netrom_transport_timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_t1,
.extra2 = &max_t1
},
{
.procname = "transport_maximum_tries",
.data = &sysctl_netrom_transport_maximum_tries,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_n2,
.extra2 = &max_n2
},
{
.procname = "transport_acknowledge_delay",
.data = &sysctl_netrom_transport_acknowledge_delay,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_t2,
.extra2 = &max_t2
},
{
.procname = "transport_busy_delay",
.data = &sysctl_netrom_transport_busy_delay,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_t4,
.extra2 = &max_t4
},
{
.procname = "transport_requested_window_size",
.data = &sysctl_netrom_transport_requested_window_size,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_window,
.extra2 = &max_window
},
{
.procname = "transport_no_activity_timeout",
.data = &sysctl_netrom_transport_no_activity_timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_idle,
.extra2 = &max_idle
},
{
.procname = "routing_control",
.data = &sysctl_netrom_routing_control,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_route,
.extra2 = &max_route
},
{
.procname = "link_fails_count",
.data = &sysctl_netrom_link_fails_count,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_fails,
.extra2 = &max_fails
},
{
.procname = "reset",
.data = &sysctl_netrom_reset_circuit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_reset,
.extra2 = &max_reset
},
{ }
};
int __init nr_register_sysctl(void)
{
nr_table_header = register_net_sysctl(&init_net, "net/netrom", nr_table);
if (!nr_table_header)
return -ENOMEM;
return 0;
}
void nr_unregister_sysctl(void)
{
unregister_net_sysctl_table(nr_table_header);
}