linux-kernel - Re: [PATCH 06/10] cachefiles, erofs: Fix NULL deref in when cachefiles is not doing ondemand-mode

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Message-ID: <3980816.1705960879@warthog.procyon.org.uk>
Date: Mon, 22 Jan 2024 22:01:19 +0000
From: David Howells <dhowells@...hat.com>
To: Jingbo Xu <jefflexu@...ux.alibaba.com>
Cc: dhowells@...hat.com, Christian Brauner <christian@...uner.io>,
    Jeff Layton <jlayton@...nel.org>,
    Matthew Wilcox <willy@...radead.org>, netfs@...ts.linux.dev,
    linux-afs@...ts.infradead.org, linux-cifs@...r.kernel.org,
    linux-nfs@...r.kernel.org, ceph-devel@...r.kernel.org,
    v9fs@...ts.linux.dev, linux-erofs@...ts.ozlabs.org,
    linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
    linux-kernel@...r.kernel.org, Marc Dionne <marc.dionne@...istor.com>,
    Gao Xiang <xiang@...nel.org>, Chao Yu <chao@...nel.org>,
    Yue Hu <huyue2@...lpad.com>
Subject: Re: [PATCH 06/10] cachefiles, erofs: Fix NULL deref in when cachefiles is not doing ondemand-mode

Jingbo Xu <jefflexu@...ux.alibaba.com> wrote:

> > -	ret = cachefiles_ondemand_init_object(object);
> > -	if (ret < 0)
> > -		goto err_unuse;
> > +	if (object->ondemand) {
> > +		ret = cachefiles_ondemand_init_object(object);
> > +		if (ret < 0)
> > +			goto err_unuse;
> > +	}
> 
> I'm not sure if object->ondemand shall be checked by the caller or
> inside cachefiles_ondemand_init_object(), as
> cachefiles_ondemand_clean_object() is also called without checking
> object->ondemand. cachefiles_ondemand_clean_object() won't trigger the
> NULL oops as the called cachefiles_ondemand_send_req() will actually
> checks that.

Meh.  The above doesn't actually build if CONFIG_CACHEFILES_ONDEMAND=N.  I
think I have to push the check down into cachefiles_ondemand_init_object()
instead.

David