linux-kernel - Re: [PATCH net v2] tipc: Fix uninit-value access in tipc_nl_node_reset_link

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Message-ID: <20231023155314.50b13861@kernel.org>
Date:   Mon, 23 Oct 2023 15:53:14 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Shigeru Yoshida <syoshida@...hat.com>
Cc:     jmaloy@...hat.com, ying.xue@...driver.com, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org,
        syzbot+5138ca807af9d2b42574@...kaller.appspotmail.com
Subject: Re: [PATCH net v2] tipc: Fix uninit-value access in
 tipc_nl_node_reset_link_stats()

On Sat, 21 Oct 2023 01:34:15 +0900 Shigeru Yoshida wrote:
> Link names must be null-terminated strings. If a link name which is not
> null-terminated is passed through netlink, strstr() and similar functions
> can cause buffer overrun. This causes the above issue.

If strings need to be null-terminated you should switch the policy here
https://elixir.bootlin.com/linux/v6.6-rc6/source/net/tipc/netlink.c#L91
from NLA_STRING to NLA_NUL_STRING, no?
-- 
pw-bot: cr