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Message-ID: <ce770d0f-20b4-8040-8625-365758351998@mojatatu.com>
Date:   Fri, 9 Jun 2023 09:30:11 -0300
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Subject: Re: [PATCH] net/sched: act_pedit: Use kmemdup() to replace kmalloc +
 memcpy
Content-Language: en-US
To:     Jiapeng Chong <jiapeng.chong@linux.alibaba.com>, jhs@mojatatu.com
Cc:     xiyou.wangcong@gmail.com, jiri@resnulli.us, davem@davemloft.net,
        edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Abaci Robot <abaci@linux.alibaba.com>
References: <20230609070117.100507-1-jiapeng.chong@linux.alibaba.com>
From:   Pedro Tammela <pctammela@mojatatu.com>
In-Reply-To: <20230609070117.100507-1-jiapeng.chong@linux.alibaba.com>
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On 09/06/2023 04:01, Jiapeng Chong wrote:
> ./net/sched/act_pedit.c:245:21-28: WARNING opportunity for kmemdup.
> 
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5478
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>

LGTM,

Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>

> ---
>   net/sched/act_pedit.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
> index fc945c7e4123..8c4e7fddddbf 100644
> --- a/net/sched/act_pedit.c
> +++ b/net/sched/act_pedit.c
> @@ -242,14 +242,12 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
>   	nparms->tcfp_flags = parm->flags;
>   	nparms->tcfp_nkeys = parm->nkeys;
>   
> -	nparms->tcfp_keys = kmalloc(ksize, GFP_KERNEL);
> +	nparms->tcfp_keys = kmemdup(parm->keys, ksize, GFP_KERNEL);
>   	if (!nparms->tcfp_keys) {
>   		ret = -ENOMEM;
>   		goto put_chain;
>   	}
>   
> -	memcpy(nparms->tcfp_keys, parm->keys, ksize);
> -
>   	for (i = 0; i < nparms->tcfp_nkeys; ++i) {
>   		u32 offmask = nparms->tcfp_keys[i].offmask;
>   		u32 cur = nparms->tcfp_keys[i].off;