[PATCH 4.14 078/105] ipvs: dont ignore errors in case refcounting ip_vs module fails

From: Greg Kroah-Hartman
Date: Mon Nov 11 2019 - 13:38:36 EST

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From: Davide Caratti <dcaratti@xxxxxxxxxx>

[ Upstream commit 62931f59ce9cbabb934a431f48f2f1f441c605ac ]

if the IPVS module is removed while the sync daemon is starting, there is
a small gap where try_module_get() might fail getting the refcount inside
ip_vs_use_count_inc(). Then, the refcounts of IPVS module are unbalanced,
and the subsequent call to stop_sync_thread() causes the following splat:

WARNING: CPU: 0 PID: 4013 at kernel/module.c:1146 module_put.part.44+0x15b/0x290
Modules linked in: ip_vs(-) nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 veth ip6table_filter ip6_tables iptable_filter binfmt_misc intel_rapl_msr intel_rapl_common crct10dif_pclmul crc32_pclmul ext4 mbcache jbd2 ghash_clmulni_intel snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_nhlt snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device snd_pcm aesni_intel crypto_simd cryptd glue_helper joydev pcspkr snd_timer virtio_balloon snd soundcore i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c ata_generic pata_acpi virtio_net net_failover virtio_blk failover virtio_console qxl drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ata_piix ttm crc32c_intel serio_raw drm virtio_pci libata virtio_ring virtio floppy dm_mirror dm_region_hash dm_log dm_mod [last unloaded: nf_defrag_ipv6]
CPU: 0 PID: 4013 Comm: modprobe Tainted: G W 5.4.0-rc1.upstream+ #741
Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
RIP: 0010:module_put.part.44+0x15b/0x290
Code: 04 25 28 00 00 00 0f 85 18 01 00 00 48 83 c4 68 5b 5d 41 5c 41 5d 41 5e 41 5f c3 89 44 24 28 83 e8 01 89 c5 0f 89 57 ff ff ff <0f> 0b e9 78 ff ff ff 65 8b 1d 67 83 26 4a 89 db be 08 00 00 00 48
RSP: 0018:ffff888050607c78 EFLAGS: 00010297
RAX: 0000000000000003 RBX: ffffffffc1420590 RCX: ffffffffb5db0ef9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffc1420590
RBP: 00000000ffffffff R08: fffffbfff82840b3 R09: fffffbfff82840b3
R10: 0000000000000001 R11: fffffbfff82840b2 R12: 1ffff1100a0c0f90
R13: ffffffffc1420200 R14: ffff88804f533300 R15: ffff88804f533ca0
FS: 00007f8ea9720740(0000) GS:ffff888053800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3245abe000 CR3: 000000004c28a006 CR4: 00000000001606f0
Call Trace:
stop_sync_thread+0x3a3/0x7c0 [ip_vs]
ip_vs_sync_net_cleanup+0x13/0x50 [ip_vs]
ops_exit_list.isra.5+0x94/0x140
unregister_pernet_operations+0x29d/0x460
unregister_pernet_device+0x26/0x60
ip_vs_cleanup+0x11/0x38 [ip_vs]
__x64_sys_delete_module+0x2d5/0x400
do_syscall_64+0xa5/0x4e0
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f8ea8bf0db7
Code: 73 01 c3 48 8b 0d b9 80 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 89 80 2c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcd38d2fe8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
RAX: ffffffffffffffda RBX: 0000000002436240 RCX: 00007f8ea8bf0db7
RDX: 0000000000000000 RSI: 0000000000000800 RDI: 00000000024362a8
RBP: 0000000000000000 R08: 00007f8ea8eba060 R09: 00007f8ea8c658a0
R10: 00007ffcd38d2a60 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000024362a8 R15: 0000000000000000
irq event stamp: 4538
hardirqs last enabled at (4537): [<ffffffffb6193dde>] quarantine_put+0x9e/0x170
hardirqs last disabled at (4538): [<ffffffffb5a0556a>] trace_hardirqs_off_thunk+0x1a/0x20
softirqs last enabled at (4522): [<ffffffffb6f8ebe9>] sk_common_release+0x169/0x2d0
softirqs last disabled at (4520): [<ffffffffb6f8eb3e>] sk_common_release+0xbe/0x2d0

Check the return value of ip_vs_use_count_inc() and let its caller return
proper error. Inside do_ip_vs_set_ctl() the module is already refcounted,
we don't need refcount/derefcount there. Finally, in register_ip_vs_app()
and start_sync_thread(), take the module refcount earlier and ensure it's
released in the error path.

Change since v1:
- better return values in case of failure of ip_vs_use_count_inc(),
thanks to Julian Anastasov
- no need to increase/decrease the module refcount in ip_vs_set_ctl(),
thanks to Julian Anastasov

Signed-off-by: Davide Caratti <dcaratti@xxxxxxxxxx>
Signed-off-by: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/netfilter/ipvs/ip_vs_app.c | 12 ++++++++++--
net/netfilter/ipvs/ip_vs_ctl.c | 14 ++++----------
net/netfilter/ipvs/ip_vs_pe.c | 3 ++-
net/netfilter/ipvs/ip_vs_sched.c | 3 ++-
net/netfilter/ipvs/ip_vs_sync.c | 13 ++++++++++---
5 files changed, 28 insertions(+), 17 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c
index 299edc6add5a6..363475b246f68 100644
--- a/net/netfilter/ipvs/ip_vs_app.c
+++ b/net/netfilter/ipvs/ip_vs_app.c
@@ -198,21 +198,29 @@ struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *

mutex_lock(&__ip_vs_app_mutex);

+ /* increase the module use count */
+ if (!ip_vs_use_count_inc()) {
+ err = -ENOENT;
+ goto out_unlock;
+ }
+
list_for_each_entry(a, &ipvs->app_list, a_list) {
if (!strcmp(app->name, a->name)) {
err = -EEXIST;
+ /* decrease the module use count */
+ ip_vs_use_count_dec();
goto out_unlock;
}
}
a = kmemdup(app, sizeof(*app), GFP_KERNEL);
if (!a) {
err = -ENOMEM;
+ /* decrease the module use count */
+ ip_vs_use_count_dec();
goto out_unlock;
}
INIT_LIST_HEAD(&a->incs_list);
list_add(&a->a_list, &ipvs->app_list);
- /* increase the module use count */
- ip_vs_use_count_inc();

out_unlock:
mutex_unlock(&__ip_vs_app_mutex);
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 4648dccebf595..6155fd6386bf4 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1197,7 +1197,8 @@ ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
struct ip_vs_service *svc = NULL;

/* increase the module use count */
- ip_vs_use_count_inc();
+ if (!ip_vs_use_count_inc())
+ return -ENOPROTOOPT;

/* Lookup the scheduler by 'u->sched_name' */
if (strcmp(u->sched_name, "none")) {
@@ -2395,9 +2396,6 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
if (copy_from_user(arg, user, len) != 0)
return -EFAULT;

- /* increase the module use count */
- ip_vs_use_count_inc();
-
/* Handle daemons since they have another lock */
if (cmd == IP_VS_SO_SET_STARTDAEMON ||
cmd == IP_VS_SO_SET_STOPDAEMON) {
@@ -2410,13 +2408,13 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
ret = -EINVAL;
if (strscpy(cfg.mcast_ifn, dm->mcast_ifn,
sizeof(cfg.mcast_ifn)) <= 0)
- goto out_dec;
+ return ret;
cfg.syncid = dm->syncid;
ret = start_sync_thread(ipvs, &cfg, dm->state);
} else {
ret = stop_sync_thread(ipvs, dm->state);
}
- goto out_dec;
+ return ret;
}

mutex_lock(&__ip_vs_mutex);
@@ -2511,10 +2509,6 @@ do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)

out_unlock:
mutex_unlock(&__ip_vs_mutex);
- out_dec:
- /* decrease the module use count */
- ip_vs_use_count_dec();
-
return ret;
}

diff --git a/net/netfilter/ipvs/ip_vs_pe.c b/net/netfilter/ipvs/ip_vs_pe.c
index 0df17caa8af6c..714e7e05c1021 100644
--- a/net/netfilter/ipvs/ip_vs_pe.c
+++ b/net/netfilter/ipvs/ip_vs_pe.c
@@ -67,7 +67,8 @@ int register_ip_vs_pe(struct ip_vs_pe *pe)
struct ip_vs_pe *tmp;

/* increase the module use count */
- ip_vs_use_count_inc();
+ if (!ip_vs_use_count_inc())
+ return -ENOENT;

mutex_lock(&ip_vs_pe_mutex);
/* Make sure that the pe with this name doesn't exist
diff --git a/net/netfilter/ipvs/ip_vs_sched.c b/net/netfilter/ipvs/ip_vs_sched.c
index a2ff7d746ebf4..3bd0ff36dc41b 100644
--- a/net/netfilter/ipvs/ip_vs_sched.c
+++ b/net/netfilter/ipvs/ip_vs_sched.c
@@ -184,7 +184,8 @@ int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
}

/* increase the module use count */
- ip_vs_use_count_inc();
+ if (!ip_vs_use_count_inc())
+ return -ENOENT;

mutex_lock(&ip_vs_sched_mutex);

diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index b578ebb3d7ef6..b373e053ff9a3 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -1771,6 +1771,10 @@ int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %zd bytes\n",
sizeof(struct ip_vs_sync_conn_v0));

+ /* increase the module use count */
+ if (!ip_vs_use_count_inc())
+ return -ENOPROTOOPT;
+
/* Do not hold one mutex and then to block on another */
for (;;) {
rtnl_lock();
@@ -1901,9 +1905,6 @@ int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
mutex_unlock(&ipvs->sync_mutex);
rtnl_unlock();

- /* increase the module use count */
- ip_vs_use_count_inc();
-
return 0;

out:
@@ -1933,11 +1934,17 @@ out:
}
kfree(ti);
}
+
+ /* decrease the module use count */
+ ip_vs_use_count_dec();
return result;

out_early:
mutex_unlock(&ipvs->sync_mutex);
rtnl_unlock();
+
+ /* decrease the module use count */
+ ip_vs_use_count_dec();
return result;
}

--
2.20.1

Next message: Greg Kroah-Hartman: "[PATCH 4.14 077/105] scsi: qla2xxx: Initialized mailbox to prevent driver load failure"
Previous message: Greg Kroah-Hartman: "[PATCH 4.14 076/105] scsi: lpfc: Honor module parameter lpfc_use_adisc"
In reply to: Greg Kroah-Hartman: "[PATCH 4.14 076/105] scsi: lpfc: Honor module parameter lpfc_use_adisc"
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