netdev - Re: [PATCH net] net: dsa: fix a crash if ->get_sset

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Message-ID: <240e9883-aec9-6c93-34a8-bb1dd63257c5@gmail.com>
Date:   Sat, 8 May 2021 10:31:44 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: fix a crash if ->get_sset_count() fails

On 5/8/21 6:30 AM, Dan Carpenter wrote:
> If ds->ops->get_sset_count() fails then it "count" is a negative error
> code such as -EOPNOTSUPP.  Because "i" is an unsigned int, the negative
> error code is type promoted to a very high value and the loop will
> corrupt memory until the system crashes.
> 
> Fix this by checking for error codes and changing the type of "i" to
> just int.
> 
> Fixes: badf3ada60ab ("net: dsa: Provide CPU port statistics to master netdev")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian