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From: "Verma, Vishal L" <vishal.l.verma@intel.com>
To: "Williams, Dan J" <dan.j.williams@intel.com>,
	"dan.carpenter@oracle.com" <dan.carpenter@oracle.com>
Cc: "kernel-janitors@vger.kernel.org"
	<kernel-janitors@vger.kernel.org>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>
Subject: Re: [PATCH] libnvdimm/namespace: Fix a signedness bug in __holder_class_store()
Date: Wed, 25 Sep 2019 17:24:09 +0000
Message-ID: <71808ca30f4e367931bf58fa3e1798371c2a5044.camel@intel.com> (raw)
In-Reply-To: <20190925110008.GK3264@mwanda>

On Wed, 2019-09-25 at 14:00 +0300, Dan Carpenter wrote:
> The "ndns->claim_class" variable is an enum but in this case GCC will
> treat it as an unsigned int so the error handling is never triggered.
> 
> Fixes: 14e494542636 ("libnvdimm, btt: BTT updates for UEFI 2.7 format")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
>  drivers/nvdimm/namespace_devs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index cca0a3ba1d2c..669985527716 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -1529,7 +1529,7 @@ static ssize_t __holder_class_store(struct device *dev, const char *buf)
>  		return -EINVAL;
>  
>  	/* btt_claim_class() could've returned an error */
> -	if (ndns->claim_class < 0)
> +	if ((int)ndns->claim_class < 0)
>  		return ndns->claim_class;
>  
>  	return 0;

Looks straightforward, and a good catch.
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>


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Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-25 11:00 Dan Carpenter
2019-09-25 17:24 ` Verma, Vishal L [this message]
2019-09-25 17:25   ` Weiny, Ira
2019-09-25 17:49     ` Verma, Vishal L
2019-09-25 18:11       ` Ira Weiny

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