| Message ID | 20201119104102.67427-1-wanghai38@huawei.com |
|---|---|
| State | New |
| Headers | show |
| Series | [net] ipvs: fix possible memory leak in ip_vs_control_net_init | expand |
Hello, On Thu, 19 Nov 2020, Wang Hai wrote: > kmemleak report a memory leak as follows: > > BUG: memory leak > unreferenced object 0xffff8880759ea000 (size 256): > comm "syz-executor.3", pid 6484, jiffies 4297476946 (age 48.546s) > hex dump (first 32 bytes): > 00 00 00 00 01 00 00 00 08 a0 9e 75 80 88 ff ff ...........u.... > 08 a0 9e 75 80 88 ff ff 00 00 00 00 ad 4e ad de ...u.........N.. > backtrace: > [<00000000c0bf2deb>] kmem_cache_zalloc include/linux/slab.h:656 [inline] > [<00000000c0bf2deb>] __proc_create+0x23d/0x7d0 fs/proc/generic.c:421 > [<000000009d718d02>] proc_create_reg+0x8e/0x140 fs/proc/generic.c:535 > [<0000000097bbfc4f>] proc_create_net_data+0x8c/0x1b0 fs/proc/proc_net.c:126 > [<00000000652480fc>] ip_vs_control_net_init+0x308/0x13a0 net/netfilter/ipvs/ip_vs_ctl.c:4169 > [<000000004c927ebe>] __ip_vs_init+0x211/0x400 net/netfilter/ipvs/ip_vs_core.c:2429 > [<00000000aa6b72d9>] ops_init+0xa8/0x3c0 net/core/net_namespace.c:151 > [<00000000153fd114>] setup_net+0x2de/0x7e0 net/core/net_namespace.c:341 > [<00000000be4e4f07>] copy_net_ns+0x27d/0x530 net/core/net_namespace.c:482 > [<00000000f1c23ec9>] create_new_namespaces+0x382/0xa30 kernel/nsproxy.c:110 > [<00000000098a5757>] copy_namespaces+0x2e6/0x3b0 kernel/nsproxy.c:179 > [<0000000026ce39e9>] copy_process+0x220a/0x5f00 kernel/fork.c:2072 > [<00000000b71f4efe>] _do_fork+0xc7/0xda0 kernel/fork.c:2428 > [<000000002974ee96>] __do_sys_clone3+0x18a/0x280 kernel/fork.c:2703 > [<0000000062ac0a4d>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 > [<0000000093f1ce2c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > In the error path of ip_vs_control_net_init(), remove_proc_entry() needs > to be called to remove the added proc entry, otherwise a memory leak > will occur. > > Fixes: b17fc9963f83 ("IPVS: netns, ip_vs_stats and its procfs") > Fixes: 61b1ab4583e2 ("IPVS: netns, add basic init per netns.") > Reported-by: Hulk Robot <hulkci@huawei.com> > Signed-off-by: Wang Hai <wanghai38@huawei.com> > --- > net/netfilter/ipvs/ip_vs_ctl.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c > index e279ded4e306..d99bb89e7c25 100644 > --- a/net/netfilter/ipvs/ip_vs_ctl.c > +++ b/net/netfilter/ipvs/ip_vs_ctl.c > @@ -4180,6 +4180,9 @@ int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs) > return 0; May be we should add some #ifdef CONFIG_PROC_FS because proc_create_net* return NULL when PROC is not used. For example: #ifdef CONFIG_PROC_FS if (!proc_create_net... goto err_vs; if (!proc_create_net... goto err_stats; ... #endif ... > err: #ifdef CONFIG_PROC_FS > + remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net); err_percpu: > + remove_proc_entry("ip_vs_stats", ipvs->net->proc_net); err_stats: > + remove_proc_entry("ip_vs", ipvs->net->proc_net); err_vs: #endif > free_percpu(ipvs->tot_stats.cpustats); > return -ENOMEM; > } > -- Regards -- Julian Anastasov <ja@ssi.bg>
在 2020/11/20 2:22, Julian Anastasov 写道: > Hello, > > On Thu, 19 Nov 2020, Wang Hai wrote: > >> kmemleak report a memory leak as follows: >> >> BUG: memory leak >> unreferenced object 0xffff8880759ea000 (size 256): >> comm "syz-executor.3", pid 6484, jiffies 4297476946 (age 48.546s) >> hex dump (first 32 bytes): >> 00 00 00 00 01 00 00 00 08 a0 9e 75 80 88 ff ff ...........u.... [...] >> Reported-by: Hulk Robot <hulkci@huawei.com> >> Signed-off-by: Wang Hai <wanghai38@huawei.com> >> --- >> net/netfilter/ipvs/ip_vs_ctl.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c >> index e279ded4e306..d99bb89e7c25 100644 >> --- a/net/netfilter/ipvs/ip_vs_ctl.c >> +++ b/net/netfilter/ipvs/ip_vs_ctl.c >> @@ -4180,6 +4180,9 @@ int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs) >> return 0; > May be we should add some #ifdef CONFIG_PROC_FS because > proc_create_net* return NULL when PROC is not used. For example: > > #ifdef CONFIG_PROC_FS > if (!proc_create_net... > goto err_vs; > if (!proc_create_net... > goto err_stats; > ... > #endif > ... > >> err: > #ifdef CONFIG_PROC_FS >> + remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net); > err_percpu: >> + remove_proc_entry("ip_vs_stats", ipvs->net->proc_net); > err_stats: >> + remove_proc_entry("ip_vs", ipvs->net->proc_net); > err_vs: > #endif > >> free_percpu(ipvs->tot_stats.cpustats); >> return -ENOMEM; >> } >> -- > Regards > > -- > Julian Anastasov <ja@ssi.bg> > > . Thanks for your advice, I just sent v2 “[PATCH net v2] ipvs: fix possible memory leak in ip_vs_control_net_init” >
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index e279ded4e306..d99bb89e7c25 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -4180,6 +4180,9 @@ int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs) return 0; err: + remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net); + remove_proc_entry("ip_vs_stats", ipvs->net->proc_net); + remove_proc_entry("ip_vs", ipvs->net->proc_net); free_percpu(ipvs->tot_stats.cpustats); return -ENOMEM; }
kmemleak report a memory leak as follows: BUG: memory leak unreferenced object 0xffff8880759ea000 (size 256): comm "syz-executor.3", pid 6484, jiffies 4297476946 (age 48.546s) hex dump (first 32 bytes): 00 00 00 00 01 00 00 00 08 a0 9e 75 80 88 ff ff ...........u.... 08 a0 9e 75 80 88 ff ff 00 00 00 00 ad 4e ad de ...u.........N.. backtrace: [<00000000c0bf2deb>] kmem_cache_zalloc include/linux/slab.h:656 [inline] [<00000000c0bf2deb>] __proc_create+0x23d/0x7d0 fs/proc/generic.c:421 [<000000009d718d02>] proc_create_reg+0x8e/0x140 fs/proc/generic.c:535 [<0000000097bbfc4f>] proc_create_net_data+0x8c/0x1b0 fs/proc/proc_net.c:126 [<00000000652480fc>] ip_vs_control_net_init+0x308/0x13a0 net/netfilter/ipvs/ip_vs_ctl.c:4169 [<000000004c927ebe>] __ip_vs_init+0x211/0x400 net/netfilter/ipvs/ip_vs_core.c:2429 [<00000000aa6b72d9>] ops_init+0xa8/0x3c0 net/core/net_namespace.c:151 [<00000000153fd114>] setup_net+0x2de/0x7e0 net/core/net_namespace.c:341 [<00000000be4e4f07>] copy_net_ns+0x27d/0x530 net/core/net_namespace.c:482 [<00000000f1c23ec9>] create_new_namespaces+0x382/0xa30 kernel/nsproxy.c:110 [<00000000098a5757>] copy_namespaces+0x2e6/0x3b0 kernel/nsproxy.c:179 [<0000000026ce39e9>] copy_process+0x220a/0x5f00 kernel/fork.c:2072 [<00000000b71f4efe>] _do_fork+0xc7/0xda0 kernel/fork.c:2428 [<000000002974ee96>] __do_sys_clone3+0x18a/0x280 kernel/fork.c:2703 [<0000000062ac0a4d>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 [<0000000093f1ce2c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 In the error path of ip_vs_control_net_init(), remove_proc_entry() needs to be called to remove the added proc entry, otherwise a memory leak will occur. Fixes: b17fc9963f83 ("IPVS: netns, ip_vs_stats and its procfs") Fixes: 61b1ab4583e2 ("IPVS: netns, add basic init per netns.") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wang Hai <wanghai38@huawei.com> --- net/netfilter/ipvs/ip_vs_ctl.c | 3 +++ 1 file changed, 3 insertions(+)