netdev - Re: [PATCH net] net: rtnetlink: fix bugs in rtnl_alt

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Date:   Sun, 16 Feb 2020 18:53:13 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com, jiri@...lanox.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] net: rtnetlink: fix bugs in rtnl_alt_ifname()

From: Eric Dumazet <edumazet@...gle.com>
Date: Wed, 12 Feb 2020 20:58:26 -0800

> Since IFLA_ALT_IFNAME is an NLA_STRING, we have no
> guarantee it is nul terminated.
> 
> We should use nla_strdup() instead of kstrdup(), since this
> helper will make sure not accessing out-of-bounds data.
 ...
> Fixes: 36fbf1e52bd3 ("net: rtnetlink: add linkprop commands to add and delete alternative ifnames")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Jiri Pirko <jiri@...lanox.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Applied and queued up for -stable.