linux-kernel - Re: [PATCH v6 3/4] ipmi: ssif_bmc: Return -EFAULT if copy_from

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Date:   Thu, 17 Mar 2022 14:45:19 +0700
From:   Quan Nguyen <quan@...amperecomputing.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Wolfram Sang <wsa@...nel.org>, Corey Minyard <minyard@....org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        openipmi-developer@...ts.sourceforge.net,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, openbmc@...ts.ozlabs.org,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v6 3/4] ipmi: ssif_bmc: Return -EFAULT if copy_from_user()
 fails

Added Dan as I have missed Dan's email address in the first place.
My apologize,
- Quan

On 11/03/2022 13:58, Wolfram Sang wrote:
> On Thu, Mar 10, 2022 at 06:41:18PM +0700, Quan Nguyen wrote:
>> From: Dan Carpenter <dan.carpenter@...cle.com>
>>
>> The copy_from_user() function returns the number of bytes remaining to
>> be copied but we should return -EFAULT here.
>>
>> Fixes: 501c25b59508 ("ipmi: ssif_bmc: Add SSIF BMC driver")
>> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>> Signed-off-by: Corey Minyard <cminyard@...sta.com>
>> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
> 
> It is nice that you want to keep this patch seperate to give Dan
> credits, but I still think it should be merged into patch 1, so the
> initial driver is as flawless as it can be. You could give Dan still
> credits by mentioning him in the commit message IMO. Dan, would you be
> fine with this?
> 
>> v6:
>>    + New add in v6, thanks Dan for the patch     [Dan]
>>
>>   drivers/char/ipmi/ssif_bmc.c | 5 ++---
>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/char/ipmi/ssif_bmc.c b/drivers/char/ipmi/ssif_bmc.c
>> index 62db97773654..91ac2cae756e 100644
>> --- a/drivers/char/ipmi/ssif_bmc.c
>> +++ b/drivers/char/ipmi/ssif_bmc.c
>> @@ -87,9 +87,8 @@ static ssize_t ssif_bmc_write(struct file *file, const char __user *buf, size_t
>>   	if (count > sizeof(struct ssif_msg))
>>   		return -EINVAL;
>>   
>> -	ret = copy_from_user(&msg, buf, count);
>> -	if (ret)
>> -		return ret;
>> +	if (copy_from_user(&msg, buf, count))
>> +		return -EFAULT;
>>   
>>   	if (!msg.len || count < ssif_msg_len(&msg))
>>   		return -EINVAL;
>> -- 
>> 2.35.1
>>