netdev - Re: [PATCH v2] net/smc: Replace use of strncpy on NUL-terminated string with strscpy

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Message-ID: <aLZt7PLarvNIedau@linux.alibaba.com>
Date: Tue, 2 Sep 2025 12:09:16 +0800
From: Dust Li <dust.li@...ux.alibaba.com>
To: James Flowers <bold.zone2373@...tmail.com>, alibuda@...ux.alibaba.com,
	sidraya@...ux.ibm.com, wenjia@...ux.ibm.com, mjambigi@...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, skhan@...uxfoundation.org
Cc: linux-rdma@...r.kernel.org, linux-s390@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH v2] net/smc: Replace use of strncpy on NUL-terminated
 string with strscpy

On 2025-08-31 20:04:59, James Flowers wrote:
>strncpy is deprecated for use on NUL-terminated strings, as indicated in
>Documentation/process/deprecated.rst. strncpy NUL-pads the destination
>buffer and doesn't guarantee the destination buffer will be NUL
>terminated.
>
>Signed-off-by: James Flowers <bold.zone2373@...tmail.com>

Reviewed-by: Dust Li <dust.li@...ux.alibaba.com>

Best regards,
Dust

>---
>V1 -> V2: Replaced with two argument version of strscpy
>Note: this has only been compile tested.
>
> net/smc/smc_pnet.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
>index 76ad29e31d60..b90337f86e83 100644
>--- 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);
> 	new_pe->ib_port = ib_port;
> 
> 	new_ibdev = true;
>-- 
>2.50.1