linux-kernel - Re: [PATCH] bfs: prevent underflow in bfs_find

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Message-ID: <20200310090644.GA11583@kadam>
Date:   Tue, 10 Mar 2020 12:06:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Walter Harms <wharms@....de>
Cc:     "Tigran A. Aivazian" <aivazian.tigran@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] bfs: prevent underflow in bfs_find_entry()

On Mon, Mar 09, 2020 at 08:40:28AM +0000, Walter Harms wrote:
> hi Dan,
> the namelen usage is fishy. It goes into bfs_namecmp()
> where it is checked for namelen < BFS_NAMELEN, leaving
> only the case ==.

The rule in bfs_namecmp() is that the name has to be NUL terminated if
there is enough space.

regards,
dan carpenter