netdev - Re: [PATCH net-next] uapi: fix signess in ethtool_validate

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Message-ID: <20170124165037-mutt-send-email-mst@kernel.org>
Date:   Tue, 24 Jan 2017 16:51:58 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Volodymyr Bendiuga <volodymyr.bendiuga@...il.com>
Cc:     David Miller <davem@...emloft.net>, nikolay@...ulusnetworks.com,
        netdev@...r.kernel.org,
        Volodymyr Bendiuga <volodymyr.bendiuga@...termo.se>,
        Jonas Johansson <jonas.johansson@...termo.se>
Subject: Re: [PATCH net-next] uapi: fix signess in ethtool_validate_speed()

On Tue, Jan 24, 2017 at 03:45:25PM +0100, Volodymyr Bendiuga wrote:
> On Fri, Jan 20, 2017 at 5:36 PM, Michael S. Tsirkin <mst@...hat.com> wrote:
> 
>     On Fri, Jan 20, 2017 at 02:20:53PM +0100, Volodymyr Bendiuga wrote:
>     > From: Jonas Johansson <jonas.johansson@...termo.se>
>     >
>     > There is a comparison of speed  variable which
>     > is unsigned, and SPEED_UNKNOWN which is signed.
> 
>     So?
>    
>     >
>     > Signed-off-by: Jonas Johansson <jonas.johansson@...termo.se>
>     > Signed-off-by: Volodymyr Bendiuga <volodymyr.bendiuga@...il.com>
>     > ---
>     >  include/uapi/linux/ethtool.h | 2 +-
>     >  1 file changed, 1 insertion(+), 1 deletion(-)
>     >
>     > diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
>     > index f0db778..1ca4a77 100644
>     > --- a/include/uapi/linux/ethtool.h
>     > +++ b/include/uapi/linux/ethtool.h
>     > @@ -1500,7 +1500,7 @@ enum ethtool_link_mode_bit_indices {
>     >
>     >  #define SPEED_UNKNOWN                -1
>     >
>     > -static inline int ethtool_validate_speed(__u32 speed)
>     > +static inline int ethtool_validate_speed(__s32 speed)
>     >  {
>     >       return speed <= INT_MAX || speed == SPEED_UNKNOWN;
>     >  }
> 
>     Then comparison to INT_MAX does not make sense.
> 
> Why doesn't it make sense?
> 

A signed integer is always <= INT_MAX.


-- 
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