linux-kernel - Re: [PATCH v4 2/2] RDMA/srp: Fix error return code in srp_parse

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Date:   Wed, 30 Nov 2022 11:31:32 +0800
From:   wangyufen <wangyufen@...wei.com>
To:     Bart Van Assche <bvanassche@....org>, <jgg@...pe.ca>,
        <leon@...nel.org>, <dennis.dalessandro@...nelisnetworks.com>
CC:     <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <andriy.shevchenko@...ux.intel.com>, <bart.vanassche@....com>,
        <easwar.hariharan@...el.com>
Subject: Re: [PATCH v4 2/2] RDMA/srp: Fix error return code in
 srp_parse_options()

I'm so sorry for the poor patch description. Is the following 
description OK?

In the previous iteration of the while loop, "ret" may have been 
assigned a value of 0, so the error return code -EINVAL may have been 
incorrectly set to 0.
Also, investigate each case separately as Andy suggessted. If the help 
function match_int() fails, the error code is returned, which is 
different from the warning information printed before. If the parsing 
result token is incorrect, "-EINVAL" is returned and the original 
warning information is printed.


Thanks.

在 2022/11/30 2:43, Bart Van Assche 写道:
> On 11/28/22 18:04, Wang Yufen wrote:
>> In the previous while loop, "ret" may be assigned zero, , so the error
> 
> The word "iteration" is missing from the above sentence. Additionally, 
> there is a double comma.
> 
>> return code may be incorrectly set to 0 instead of -EINVAL. Alse
> 
> Alse -> Also
> 
>>           case SRP_OPT_QUEUE_SIZE:
>> -            if (match_int(args, &token) || token < 1) {
>> +            ret = match_int(args, &token);
>> +            if (ret)
>> +                goto out;
>> +            if (token < 1) {
>>                   pr_warn("bad queue_size parameter '%s'\n", p);
>> +                ret = -EINVAL;
>>                   goto out;
>>               }
>>               target->scsi_host->can_queue = token;
> 
> Why only to report "bad queue_size parameter" if ret == 0 && token < 1 
> but not if ret < 0? This is a behavior change that has not been 
> explained in the patch description.
> 
>> @@ -3490,25 +3496,34 @@ static int srp_parse_options(struct net *net, 
>> const char *buf,
>>               break;
>>           case SRP_OPT_MAX_CMD_PER_LUN:
>> -            if (match_int(args, &token) || token < 1) {
>> +            ret = match_int(args, &token);
>> +            if (ret)
>> +                goto out;
>> +            if (token < 1) {
>>                   pr_warn("bad max cmd_per_lun parameter '%s'\n",
>>                       p);
>> +                ret = -EINVAL;
>>                   goto out;
>>               }
>>               target->scsi_host->cmd_per_lun = token;
>>               break;
> 
> Same comment here and for many other changes below.
> 
> Thanks,
> 
> Bart.
> 
>