netdev - Re: [PATCH ethtool 2/3] ethtool: use dummy args[] entry for no-args case

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Date:   Tue, 24 Aug 2021 19:41:23 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     andrew@...n.ch, netdev@...r.kernel.org, dcavalca@...com,
        filbranden@...com, michel@...com
Subject: Re: [PATCH ethtool 2/3] ethtool: use dummy args[] entry for no-args
 case

On Fri, Aug 13, 2021 at 10:19:37AM -0700, Jakub Kicinski wrote:
> Note that this patch adds a false-positive warning with GCC 11:
> 
> ethtool.c: In function ‘find_option’:
> ethtool.c:6082:29: warning: offset ‘1’ outside bounds of constant string [-Warray-bounds]
>  6082 |                         opt += len + 1;
>       |                         ~~~~^~~~~~~~~~
> 
> we'll never get to that code if the string is empty.

Unless I missed something, an easy workaround should be starting the
loop in find_option() from 1 rather than from 0. It would IMHO even make
more sense as there is little point comparing the first argument against
the dummy args[0] entry.

Michal

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