linux-kernel - Re: [PATCH] nilfs2: Add pointer check for nilfs_direct

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Message-ID: <CAKFNMomx3hpQrntyO0zQZviPa40LiC5KqxFa-m1PZcnZ7ku58A@mail.gmail.com>
Date: Wed, 2 Apr 2025 20:31:08 +0900
From: Ryusuke Konishi <konishi.ryusuke@...il.com>
To: Wentao Liang <vulab@...as.ac.cn>
Cc: linux-nilfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH] nilfs2: Add pointer check for nilfs_direct_propagate()

On Wed, Apr 2, 2025 at 5:59 PM Wentao Liang wrote:
>
> In nilfs_direct_propagate(), the printer get from nilfs_direct_get_ptr()
> need to be checked to ensure it is not an invalid pointer. A proper
> implementation can be found in nilfs_direct_delete(). Add a value check
> and return -ENOENT when it is an invalid pointer.
>
> Fixes: 10ff885ba6f5 ("nilfs2: get rid of nilfs_direct uses")
> Cc: stable@...r.kernel.org # v2.6+
> Signed-off-by: Wentao Liang <vulab@...as.ac.cn>
> ---
>  fs/nilfs2/direct.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/fs/nilfs2/direct.c b/fs/nilfs2/direct.c
> index 893ab36824cc..ff1c9fe72bec 100644
> --- a/fs/nilfs2/direct.c
> +++ b/fs/nilfs2/direct.c
> @@ -273,6 +273,9 @@ static int nilfs_direct_propagate(struct nilfs_bmap *bmap,
>         dat = nilfs_bmap_get_dat(bmap);
>         key = nilfs_bmap_data_get_key(bmap, bh);
>         ptr = nilfs_direct_get_ptr(bmap, key);
> +       if (ptr == NILFS_BMAP_INVALID_PTR)
> +               return -ENOENT;
> +
>         if (!buffer_nilfs_volatile(bh)) {
>                 oldreq.pr_entry_nr = ptr;
>                 newreq.pr_entry_nr = ptr;
> --
> 2.42.0.windows.2
>

This patch requires review and correction.
To avoid noise, I will comment on it separately in a reply email that
excludes the stable ML.

As a comment in advance, the commit pointed to by the Fixes tag is not
the commit that caused the issue, and the version specification "#
v2.6+" includes versions prior to nilfs2 mainline integration, so it
is unnecessary.

Regards,
Ryusuke Konishi