linux-kernel - Re: [PATCH v2 net] ptp: fix integer overflow in max_vclocks

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Message-ID: <c7e7be36-7aa2-423d-9c95-96aed2844aa5@linux.alibaba.com>
Date: Mon, 17 Jun 2024 22:55:08 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Richard Cochran <richardcochran@...il.com>,
 "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Yangbo Lu <yangbo.lu@....com>
Subject: Re: [PATCH v2 net] ptp: fix integer overflow in max_vclocks_store

在 2024/6/17 下午5:34, Dan Carpenter 写道:
> On 32bit systems, the "4 * max" multiply can overflow.  Use kcalloc()
> to do the allocation to prevent this.
>
> Fixes: 44c494c8e30e ("ptp: track available ptp vclocks information")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
> v2: It's better to use kcalloc() instead of size_mul().
>
>   drivers/ptp/ptp_sysfs.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
> index a15460aaa03b..6b1b8f57cd95 100644
> --- a/drivers/ptp/ptp_sysfs.c
> +++ b/drivers/ptp/ptp_sysfs.c
> @@ -296,8 +296,7 @@ static ssize_t max_vclocks_store(struct device *dev,
>   	if (max < ptp->n_vclocks)
>   		goto out;
>   
> -	size = sizeof(int) * max;
> -	vclock_index = kzalloc(size, GFP_KERNEL);
> +	vclock_index = kcalloc(max, sizeof(int), GFP_KERNEL);
>   	if (!vclock_index) {
>   		err = -ENOMEM;
>   		goto out;

Reviewed-by: Heng Qi <hengqi@...ux.alibaba.com>

Thanks!