linux-kernel - Re: [PATCH] kernel/nsproxy.c: Fix memory leak of create_new

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Date:	Tue, 18 Oct 2011 15:19:55 +0800
From:	wzt wzt <wzt.wzt@...il.com>
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	linux-kernel@...r.kernel.org, serue@...ibm.com, xemul@...nvz.org,
	ebiederm@...ssion.com
Subject: Re: [PATCH] kernel/nsproxy.c: Fix memory leak of create_new_namespaces().

Sorry for the wrong patch, thanks Feng to point it out.

On Tue, Oct 18, 2011 at 2:26 PM, Xiaotian Feng <xtfeng@...il.com> wrote:
>
>
> On Tue, Oct 18, 2011 at 2:07 PM, wzt <wzt.wzt@...il.com> wrote:
>>
>> copy_pid_ns() has allocted some memory via create_pid_namespace(), if
>> copy_net_ns()
>> failed via create_new_namespaces(), it will cause memory leak. The
>> copy_utsname()
>> have the same problem.
>>
>> Signed-off-by: Zhitong Wang <zhitong.wangzt@...baba-inc.com>
>>
>> ---
>>  kernel/nsproxy.c |    8 ++++++--
>>  1 files changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
>> index 9aeab4b..fdcec31 100644
>> --- a/kernel/nsproxy.c
>> +++ b/kernel/nsproxy.c
>> @@ -99,14 +99,18 @@ static struct nsproxy *create_new_namespaces(unsigned
>> long flags,
>>        return new_nsp;
>>
>>  out_net:
>> -       if (new_nsp->pid_ns)
>> +       if (new_nsp->pid_ns) {
>>                put_pid_ns(new_nsp->pid_ns);
>> +               free_pid_ns(&new_nsp->pid_ns->kref);
>
> It is freed in put_pid_ns() if the last user is gone. Please check the
> implementation of put_pid_ns().
>
>>
>> +       }
>>  out_pid:
>>        if (new_nsp->ipc_ns)
>>                put_ipc_ns(new_nsp->ipc_ns);
>>  out_ipc:
>> -       if (new_nsp->uts_ns)
>> +       if (new_nsp->uts_ns) {
>>                put_uts_ns(new_nsp->uts_ns);
>> +               free_uts_ns(&new_nsp->pid_ns->kref);
>
>  same
>>
>> +       }
>>  out_uts:
>>        if (new_nsp->mnt_ns)
>>                put_mnt_ns(new_nsp->mnt_ns);
>> --
>> 1.7.4.1
>>
>> --
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>
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