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From: Bruce Richardson <bruce.richardson@intel.com>
To: Anatoly Burakov <anatoly.burakov@intel.com>
Cc: dev@dpdk.org, David Hunt <david.hunt@intel.com>, reshma.pattan@intel.com
Subject: Re: [dpdk-dev] [PATCH v2 1/2] power: fix power management env detection
Date: Mon, 13 Jul 2020 16:33:21 +0100
Message-ID: <20200713153321.GJ694@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <42bebf7cebd2b635a60b626faf605df6d8a277c1.1594652063.git.anatoly.burakov@intel.com>

On Mon, Jul 13, 2020 at 03:54:27PM +0100, Anatoly Burakov wrote:
> Anything coming from sysfs has a newline at the end. Cut it off before
> comparing the strings.
> 
> Fixes: 20ab67608a39 ("power: add environment capability probing")
> 
> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
> Acked-by: David Hunt <david.hunt@intel.com>
> ---
>  lib/librte_power/power_common.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/lib/librte_power/power_common.c b/lib/librte_power/power_common.c
> index 59023d986b..22b016ca9d 100644
> --- a/lib/librte_power/power_common.c
> +++ b/lib/librte_power/power_common.c
> @@ -15,6 +15,7 @@ int
>  cpufreq_check_scaling_driver(const char *driver_name)
>  {
>  	unsigned int lcore_id = 0; /* always check core 0 */
> +	size_t end_idx;
>  	char fullpath[PATH_MAX];
>  	char readbuf[PATH_MAX];
>  	char *s;
> @@ -39,6 +40,13 @@ cpufreq_check_scaling_driver(const char *driver_name)
>  	if (s == NULL)
>  		return 0;
>  
> +	/* when read from sysfs, driver name has an extra newline at the end */
> +	end_idx = strnlen(readbuf, sizeof(readbuf));
> +	/* prevent underflow if len is zero */
> +	if (end_idx > 0)
> +		end_idx--;
> +	readbuf[end_idx] = '\0';
> +
Would it not be safer to add " && readbuf[end_idx - 1] == '\n'" to the
condition, to check that it's terminated as expected? Theoretically if we
had a long string returned which was truncated, or only just fit, there
would not be a '\n' at the end.

/Bruce

  reply	other threads:[~2020-07-13 15:33 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-13 12:15 [dpdk-dev] [PATCH " Anatoly Burakov
2020-07-13 12:15 ` [dpdk-dev] [PATCH 2/2] l3fwd-power: fix updating performance lcore parameters Anatoly Burakov
2020-07-13 12:29   ` Hunt, David
2020-07-13 12:26 ` [dpdk-dev] [PATCH 1/2] power: fix power management env detection Hunt, David
2020-07-13 14:54 ` [dpdk-dev] [PATCH v2 " Anatoly Burakov
2020-07-13 15:33   ` Bruce Richardson [this message]
2020-07-14  9:34     ` Burakov, Anatoly
2020-07-14 10:30   ` [dpdk-dev] [PATCH v3 " Anatoly Burakov
2020-07-15  4:18     ` Ma, LihongX
2020-07-17 12:50     ` Bruce Richardson
2020-07-21 23:57       ` Thomas Monjalon
2020-07-14 10:30   ` [dpdk-dev] [PATCH v3 2/2] l3fwd-power: fix updating performance lcore parameters Anatoly Burakov
2020-07-13 14:54 ` [dpdk-dev] [PATCH v2 " Anatoly Burakov

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