linux-kernel - Re: [PATCH] ksmbd: fix possible refcount leak in smb2

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Date:   Tue, 7 Mar 2023 18:27:31 +0900
From:   Namjae Jeon <linkinjeon@...nel.org>
To:     ChenXiaoSong <chenxiaosong2@...wei.com>
Cc:     sfrench@...ba.org, stfrench@...rosoft.com,
        linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ksmbd: fix possible refcount leak in smb2_open()

2023-03-07 17:52 GMT+09:00, ChenXiaoSong <chenxiaosong2@...wei.com>:
> Hi Namjae and Steve:
Hi Chen,
>
> Do you have any suggestions for this patch?
Sorry, It was in the spam box...
I have sent ack. Thanks for noticing.
>
> 在 2023/3/2 21:58, ChenXiaoSong 写道:
>> Reference count of acls will leak when memory allocation fails. Fix this
>> by adding the missing posix_acl_release().
>>
>> Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
>> Signed-off-by: ChenXiaoSong <chenxiaosong2@...wei.com>
>> ---
>>   fs/ksmbd/smb2pdu.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
>> index 0685c1c77b9f..f04d810a2588 100644
>> --- a/fs/ksmbd/smb2pdu.c
>> +++ b/fs/ksmbd/smb2pdu.c
>> @@ -2977,8 +2977,11 @@ int smb2_open(struct ksmbd_work *work)
>>   							sizeof(struct smb_acl) +
>>   							sizeof(struct smb_ace) * ace_num * 2,
>>   							GFP_KERNEL);
>> -					if (!pntsd)
>> +					if (!pntsd) {
>> +						posix_acl_release(fattr.cf_acls);
>> +						posix_acl_release(fattr.cf_dacls);
>>   						goto err_out;
>> +					}
>>
>>   					rc = build_sec_desc(idmap,
>>   							    pntsd, NULL, 0,
>>
>