linux-kernel - Re: [PATCH] fs: ext4: initialize fsdata in pagecache

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Message-ID: <CAG_fn=VaBW3NBULC1JGhJW7hhWBb-h6Me_wecktt0Mgo+m8VeQ@mail.gmail.com>
Date:   Mon, 21 Nov 2022 12:23:57 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org,
        chao@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org,
        syzbot+9767be679ef5016b6082@...kaller.appspotmail.com
Subject: Re: [PATCH] fs: ext4: initialize fsdata in pagecache_write()

On Mon, Nov 14, 2022 at 7:20 PM Eric Biggers <ebiggers@...nel.org> wrote:
>
> On Mon, Nov 14, 2022 at 09:29:35AM +0100, Alexander Potapenko wrote:
> > [PATCH] fs: ext4: initialize fsdata in pagecache_write()
> >
> > When aops->write_begin() does not initialize fsdata, KMSAN reports
> > an error passing the latter to aops->write_end().
> >
> > Fix this by unconditionally initializing fsdata.
> >
> > Also speculatively fix similar issues in affs, f2fs, hfs, hfsplus,
> > as suggested by Eric Biggers.
>
> You might have better luck with separate patches for each filesystem, as it
> might be hard to get someone to apply this patch otherwise.

Done.
Please disregard this patch.

> If you do go with a single patch, then the subject prefix should be "fs:", not
> "fs: ext4:".
>
> - Eric



-- 
Alexander Potapenko
Software Engineer

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