linux-kernel - Re: [PATCH 2/3] fs: dlm: Fix the size of a buffer in dlm_create_debug

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Message-ID: <CAK-6q+ifLNmM_nT5MGy9SPAmx61=AogkyNsGw=yPdYPsUsFcyg@mail.gmail.com>
Date:   Fri, 22 Sep 2023 16:03:00 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Christine Caulfield <ccaulfie@...hat.com>,
        David Teigland <teigland@...hat.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        gfs2@...ts.linux.dev
Subject: Re: [PATCH 2/3] fs: dlm: Fix the size of a buffer in dlm_create_debug_file()

Hi,

On Fri, Sep 22, 2023 at 1:38 PM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> 8 is not the maximum size of the suffix used when creating debugfs files.
>
> Let the compiler compute the correct size, and only give a hint about the
> longest possible string that is used.
>
> When building with W=1, this fixes the following warnings:
>
>   fs/dlm/debug_fs.c: In function ‘dlm_create_debug_file’:
>   fs/dlm/debug_fs.c:1020:58: error: ‘snprintf’ output may be truncated before the last format character [-Werror=format-truncation=]
>    1020 |         snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name);
>         |                                                          ^
>   fs/dlm/debug_fs.c:1020:9: note: ‘snprintf’ output between 9 and 73 bytes into a destination of size 72
>    1020 |         snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_waiters", ls->ls_name);
>         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   fs/dlm/debug_fs.c:1031:50: error: ‘_queued_asts’ directive output may be truncated writing 12 bytes into a region of size between 8 and 72 [-Werror=format-truncation=]
>    1031 |         snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_queued_asts", ls->ls_name);
>         |                                                  ^~~~~~~~~~~~
>   fs/dlm/debug_fs.c:1031:9: note: ‘snprintf’ output between 13 and 77 bytes into a destination of size 72
>    1031 |         snprintf(name, DLM_LOCKSPACE_LEN + 8, "%s_queued_asts", ls->ls_name);
>         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Fixes: 541adb0d4d10b ("fs: dlm: debugfs for queued callbacks")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

there is a similar patch [0] already in the queue for dlm.

- Alex

[0] https://lore.kernel.org/gfs2/20230906143153.1353077-5-aahringo@redhat.com/T/#u