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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 8 May 2021 19:25:36 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        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 Sat, May 08, 2021 at 04:30:35PM +0300, 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: Andrew Lunn <andrew@...n.ch>

    Andrew