linux-kernel - Re: [PATCH][next] platform/x86: intel_pmc_core: fix unsigned variable compared to less than zero

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Date:   Tue, 20 Apr 2021 17:02:48 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Colin King <colin.king@...onical.com>,
        Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        David E Box <david.e.box@...el.com>,
        Mark Gross <mgross@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] platform/x86: intel_pmc_core: fix unsigned variable
 compared to less than zero

Hi Colin,

On 4/20/21 2:10 PM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The check for ret < 0 is always false because ret is a (unsigned) size_t
> and not a (signed) ssize_t, hence simple_write_to_buffer failures are
> never detected. Fix this by making ret a ssize_t
> 
> Addresses-Coverity: ("Unsigned compared against 0")
> Fixes: 8074a79fad2e ("platform/x86: intel_pmc_core: Add option to set/clear LPM mode")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thank you for the patch, but I already send out the same patch myself
yesterday, so this is a duplicate.

Regards,

Hans



> ---
>  drivers/platform/x86/intel_pmc_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
> index 3ae00ac85c75..d174aeb492e0 100644
> --- a/drivers/platform/x86/intel_pmc_core.c
> +++ b/drivers/platform/x86/intel_pmc_core.c
> @@ -1360,7 +1360,7 @@ static ssize_t pmc_core_lpm_latch_mode_write(struct file *file,
>  	struct pmc_dev *pmcdev = s->private;
>  	bool clear = false, c10 = false;
>  	unsigned char buf[8];
> -	size_t ret;
> +	ssize_t ret;
>  	int idx, m, mode;
>  	u32 reg;
>  
>