linux-kernel - Re: [PATCH] net/smc: replace strncpy with strscpy for ib

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Message-ID: <24ced585-1b7f-4577-9cb5-8d6e60ecb363@linux.ibm.com>
Date: Fri, 12 Sep 2025 13:18:52 +0530
From: Mahanta Jambigi <mjambigi@...ux.ibm.com>
To: Leon Romanovsky <leon@...nel.org>,
        Kriish Sharma <kriish.sharma2006@...il.com>
Cc: alibuda@...ux.alibaba.com, dust.li@...ux.alibaba.com,
        sidraya@...ux.ibm.com, wenjia@...ux.ibm.com, tonylu@...ux.alibaba.com,
        guwen@...ux.alibaba.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
        linux-rdma@...r.kernel.org, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] net/smc: replace strncpy with strscpy for ib_name

On 10/09/25 3:31 pm, Leon Romanovsky wrote:
>> --- a/net/smc/smc_pnet.c
>> +++ b/net/smc/smc_pnet.c
>> @@ -450,7 +450,7 @@ static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name,
>>  		return -ENOMEM;
>>  	new_pe->type = SMC_PNET_IB;
>>  	memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
>> -	strncpy(new_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX);
>> +	strscpy(new_pe->ib_name, ib_name);
> 
> It is worth to mention that caching ib_name is wrong as IB/core provides
> IB device rename functionality.

In our case we hit this code path where we pass *PCI_ID*
as the *ib_name* using *smc_pnet* tool(smc_pnet -a <pnet_name> -D
<PCI_ID>). I believe PCI_ID will not change, so caching it here is fine.