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Message-ID: <3a1d4ad3-3f85-4ccb-130a-ba3b58d7eeb4@huaweicloud.com>
Date: Sun, 28 May 2023 15:48:07 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: linan666@...weicloud.com, song@...nel.org
Cc: linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
linan122@...wei.com, yi.zhang@...wei.com, houtao1@...wei.com,
yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] md/bitmap: check input value with ULONG_MAX in
timeout_store
Hi,
在 2023/05/27 18:18, linan666@...weicloud.com 写道:
> From: Li Nan <linan122@...wei.com>
>
> The type of timeout is unsigned long, but it is compared with 'LONG_MAX'
> in timeout_store(), which lead to value within (LONG_MAX, ULONG_MAX.]/HZ
> can't be set. Fix it by checking input value with ULONG_MAX.
>
nak, because MAX_SCHEDULE_TIMEOUT is LONG_MAX, and LONG_MAX should be
enough for real use case.
Thanks,
Kuai
> Signed-off-by: Li Nan <linan122@...wei.com>
> ---
> drivers/md/md-bitmap.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
> index bc8d7565171d..5fd9cba65be8 100644
> --- a/drivers/md/md-bitmap.c
> +++ b/drivers/md/md-bitmap.c
> @@ -2460,7 +2460,7 @@ timeout_store(struct mddev *mddev, const char *buf, size_t len)
> return rv;
>
> /* just to make sure we don't overflow... */
> - if (timeout >= LONG_MAX / HZ)
> + if (timeout >= ULONG_MAX / HZ)
> return -EINVAL;
>
> timeout = timeout * HZ / 10000;
>
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